Summer Clover
Mango PartyNT$ 329
Giga Oppai Expo Steam Sale｜105 Big-Bust Adult Games, 10/29–11/12 (Pacific Time)
Giga Oppai Expo is a Steam sale organized by HGamer and 7 publishers, featuring 105 adult games with a large-bust theme: 73 released titles and 32 upcoming titles. The event runs from October 29, 2026 at 10:00 to November 12, 2026 at 10:00 Pacific Time. This page provides game descriptions, discounts, publisher and release filters, and 4 HGamer's Choice bundles. Upcoming titles can be added to the Steam wishlist. Prices and discount deadlines are determined by Steam.
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XXXL
Dieselmine
SIZE CHARTHGamer's Choice bundles
4 bundles · 6 + 6 + 6 + 3 gamesLLarge Oppai Bundle
Large Oppai Bundle contains 6 games in the L selection of HGamer's Choice. Bundle contents and final prices are listed on Steam.
XLXL Oppai Bundle
XL Oppai Bundle contains 6 games in the XL selection of HGamer's Choice. Bundle contents and final prices are listed on Steam.
XXLXXL Oppai Bundle
XXL Oppai Bundle contains 6 games in the XXL selection of HGamer's Choice. Bundle contents and final prices are listed on Steam.
Mikan Batake Bundle
View bundle on SteamMikan Batake Bundle contains 3 games featuring artwork by Mikan Batake as part of HGamer's Choice. Bundle contents and final prices are listed on Steam.
Bundles receive an additional discount. Final prices are displayed on Steam.
ALL GAMESAll participating games
7 publishers · 105 gamesMango Party participates with 26 titles, covering relationship stories, management simulations, dungeon adventures and tower defense. Summer Clover follows a summer spent working in a household of three sisters, while Guardians of Eden-Embrace of the Forest combines character development with defensive battles. Living with the Absolute Bustiest College Girl! focuses on a shared home and a growing relationship. The lineup also includes upcoming games such as Violet Saga, a side-scrolling fantasy action adventure, and Peeping Office Worker, built around investigating coworkers' secrets.
Saikey Studios participates with 21 titles across story-driven role-playing games, visual novels, action and simulation. Jezebel is set in medieval Rosegate, while My Ghost Roommate is a romantic comedy about sharing an apartment with a shy ghost. Arena of Sacrifice offers side-scrolling combat through difficult stages. Upcoming games include Sexchmia, an alchemy role-playing game about gathering materials and completing quests, alongside other fantasy adventures and character-focused simulations in the publisher's event selection.
072 project contributes 13 games, with fantasy adventures, character progression and branching stories across the selection. Lutnak·Quest follows an adventurer seeking better equipment and higher-ranked work. Trials of interspecies Sisters~Erotic exchange with Humans~ begins with nuns sent to human territory after a war. Upcoming entries include Demon General Kirsten, about a soldier reconsidering her way of life, and Mikael The Apprentice Merchant, whose aspiring merchant needs to raise money for a childhood friend's medical care.
Playmeow participates with 13 titles spanning escape-room puzzles, daily-life simulation, farming and action role-playing games. Escape from the Room of the Serving Doll pairs room-escape puzzles with an android companion, and The Daily Life of Serving Doll continues her story in a daily-life sim. Fox Sex Farm adds farming and exploration. Upcoming games include Three Days at the Seaside House with a Serving Doll, set during a seaside stay with that android, and Fox Village Defense, a defense action role-playing game with materials to collect, equipment to improve and monsters to fight.
Shiravune's 13 entries, comprising 10 released and 3 upcoming titles, include visual novels, fantasy role-playing games and character-development games. Project Android centers on android development through experiments, while Cosplayer's Quest follows a cosplayer trying to fund a clothing shop in another world. Infiltrating Roudille takes a lone knight into enemy territory in a retro-style Japanese role-playing game. The selection also includes Cosplaying in Costalia: The Tororo Sisters!, a visual novel about a cosplay photography trip with two sisters.
Alice Publication's 10 entries range from visual novels to turn-based role-playing games and action games. Jerez's Arena Ⅲ combines map exploration, story scenes and arena combat, while LUNA centers on a woman using mysterious powers against powerful enemies. Married Into Hell mixes dice-based combat with a romantic comedy. Among the upcoming titles, Replica Rose Recall follows an amnesiac heroine through a mysterious castle in a Japanese-style action role-playing game, and Roomies with a Naughty Comic Artist explores life with a manga artist.
Dieselmine's nine entries include countryside life simulations, fantasy settings and science-fiction encounters. Summer~Life in the Countryside~ centers on a summer reunion, with +Outing listed as downloadable content for that game. Winter ~Life in the Countryside~ changes the season, while SUMMER -14 Days Vacation- begins with a call to an island guesthouse. Dusk City takes place in a world of perpetual night. That Time I Got Abducted by KYONYUU ALIENS adds an alien-abduction premise to the lineup.
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The Agnietta ~The holy healer & the cursed dungeon~
Mango PartyNT$ 249
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Fallen Shinobi SS.
Mango PartyNT$ 319
Daily life with my succubus boss
Mango PartyNT$ 199
Fallen Elf Freya
PlaymeowNT$ 188
Mirai's Midnight Stream
Mango PartyNT$ 298
Jerez's Arena Ⅲ
Alice PublicationNT$ 399
Kurage Life
Mango PartyNT$ 220
Open At Nine
Mango PartyNT$ 299
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Isekai Janken Hero
Mango PartyNT$ 249
Escape from the Room of the Serving Doll
PlaymeowHuge bustNT$ 138
Fox Sex Farm
PlaymeowNT$ 320
Dusk City
DieselmineNT$ 408
Solo leeching~35-Year-Old Magician Journey
072 projectHuge bustNT$ 198
Married Into Hell
Alice PublicationNT$ 268
The Daily Life of Serving Doll
PlaymeowHuge bustNT$ 138
Winter ~Life in the Countryside~
DieselmineNT$ 408
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Whispered Promises ~ 14 Days of Love with Anna
072 projectNT$ 278
SUMMER -14 Days Vacation-
DieselmineNT$ 408
Imperial Knightess Wein's Irregular Life
072 projectNT$ 118
Mirai's Midnight Training
Mango PartyNT$ 159
Saintess Eruna and the Lustful Book of Corruption ~Busty Sister's H Services~
072 projectHuge bustNT$ 172
Trials of interspecies Sisters~Erotic exchange with Humans~
072 projectHuge bustNT$ 281
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Elena's Lewd Service
072 projectNT$ 268
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Fallen Kunoichi ~Netorare Hidden Village~
Saikey StudiosNT$ 172
Busty Idol Manor
Mango PartyHuge bustNT$ 249
Busty Milf and Summer Country Sex Life
DieselmineHuge bustNT$ 408
My Ghost Roommate
Saikey StudiosNT$ 118
Bikini Tits
白舟 ShiravuneNT$ 378
Heavenly Badonkers Angel Bitches
DieselmineHuge bustNT$ 310
Dusk City - Beacon of Tranquility
DieselmineNT$ 377
That Time I Got Abducted by KYONYUU ALIENS
DieselmineNT$ 238
Summer~Life in the Countryside~
DieselmineNT$ 310
The Endless Abyss: A Busty Cop’s Corrupted Soul
PlaymeowNT$ 275
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Summer~Life in the Countryside~ +Outing
DieselmineNT$ 248
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Philomel
Saikey StudiosNT$ 188
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NewsLiving with the Absolute Bustiest College Girl!
Mango PartyHuge bust30 Oct, 2026
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NewsHow to Train Your Spirit: The Exorcism of a Busty Ghost
Alice PublicationQ4 2026
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NewsPushu Pushu! Let's rescue the girls in danger!
Alice PublicationComing soon
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CALENDAR2026 Steam Sale Calendar
| Sale event | Dates (Pacific Time) | Status |
|---|---|---|
| Steam Spring Sale | 3/19 – 3/26 | Ended |
| Steam Summer Sale | 6/25 – 7/9 | Ended |
| NTR Carnival | 9/22 – 10/6 | Ended |
| Steam Autumn Sale | 10/1 – 10/8 | Ended |
| Steam Next Fest | 10/19 – 10/26 | Live |
| Steam Scream Fest (Halloween) | 10/26 – 11/2 | Upcoming |
| Giga Oppai Expo | 10/29 – 11/12 | This page |
| Steam Winter Sale | 12/17 – 2027/1/4 | Upcoming |
All dates use Pacific Time. Giga Oppai Expo runs from October 29, 2026 at 10:00 to November 12, 2026 at 10:00, overlapping Steam Scream Fest from October 29 to November 2.
Steam sales, the 2026 schedule, price comparisons and event information
What is a Steam sale?
A Steam sale is a limited-time discount event on Steam. The seasonal calendar includes Spring, Summer, Autumn and Winter sales, alongside themed events such as Steam Scream Fest. Steam Next Fest is listed separately in the calendar. Giga Oppai Expo is a joint event organized by 7 publishers and HGamer around adult games with a large-bust theme. Its participating titles include released and upcoming games. Participation does not indicate that a game is available for purchase or discounted; the discount table lists the games and bundles offered at reduced prices.
2026 Steam sale dates and the next seasonal sale
The 2026 schedule uses Pacific Time: Spring Sale March 19–26, Summer Sale June 25–July 9, Autumn Sale October 1–8, Steam Next Fest October 19–26, Steam Scream Fest October 26–November 2, and Winter Sale December 17–January 4, 2027. HGamer's previous joint event, NTR Carnival, ran September 22–October 6. Giga Oppai Expo runs October 29–November 12, overlapping Scream Fest from October 29 to November 2. The next seasonal sale after the Expo is the Winter Sale on December 17. The Expo starts at 10:00 Pacific Time on October 29 and ends at 10:00 Pacific Time on November 12; in Taiwan, that is October 30 at 01:00 through November 13 at 02:00.
How to compare Steam sale prices
Individual game prices and bundle prices can be compared using the listed discounts and bundle contents. The 4 HGamer's Choice bundles comprise Large Oppai Bundle, XL Oppai Bundle and XXL Oppai Bundle with 6 games each, and Mikan Batake Bundle with 3 games featuring artwork by the same artist. Bundles receive an additional discount. The table displays Taiwan store prices in New Taiwan dollars; purchase prices and discount deadlines are determined by the applicable Steam store region. Upcoming titles can be added to the Steam wishlist.
Big-bust adult games and patches
Large-bust, oppai and kyonyuu describe a character-design theme across several adult game genres. Participating titles include visual novels, relationship and management simulations, role-playing games, puzzle games and action games. Publisher and release filters apply to the 105 participating titles, alongside a separate huge-bust filter. Patch information for some games is available through the patch button and the linked HGamer game page. Game links lead to HGamer descriptions where available and otherwise to Steam store pages.
About Giga Oppai Expo
Giga Oppai Expo is a joint Steam sale organized by HGamer with Mango Party, Saikey Studios, 072 project, Playmeow, Shiravune, Alice Publication and Dieselmine. It runs from October 29, 2026 at 10:00 to November 12, 2026 at 10:00 Pacific Time, with 105 participating titles: 73 released and 32 upcoming. This page provides game information, discounted titles and 4 HGamer's Choice bundles. The main artwork uses L, XL, XXL and XXXL character labels, and the bundle section follows a size-chart layout. Availability, prices and bundle contents are specified on Steam.