Omega Labyrinth

Omega Labyrinth is a roguelike dungeon crawler role-playing game. The dungeon is randomly generated; each time Aina and her accomplices enters the dungeon, its map, monsters, and available items change. As players move within the dungeon, the monsters also move in a turn-based fashion. Players accumulate experience by defeating monsters and characters become stronger as they level up.

If they leave the dungeon, the characters are reduced back to level 1, and all items are lost when the health bar reaches zero. Thus, missions must be completed all in one go. The goal of the game is to search for and obtain the "Holy Grail of Beauty", whilst defeating monsters and avoiding traps through utilizing items, armor, and weapons.

Aina Akemiya (朱宮 愛那) (voiced by Haruka Yamazaki), the lively and energetic protagonist of the game. She is obsessed with the size of her small breasts, and thus enters the dungeon in search of the "Holy Grail of Beauty" to grant her wish of enlarging them. Although not an honor student, she is popular enough to be oftentimes the center of attention.

Nako Mito (美桃 なこ) (voiced by Aya Uchida), a skillful cook and Aina's best friend, and was invited by her to challenge the dungeon together. She has a voluptous chest when compared to Aina.

Four Famitsu reviewers scored Omega Labyrinth 7, 7, 7 and 8 out of 10, for a total score of 29/40. The game sold 25,000 copies during its first week on sale in Japan.

Richard Eisenbeis of Kotaku summed up the game as "an odd mix of breast-filled fanservice and unforgiving dungeon crawling". He wrote that players who enjoy fanservice or challenging gameplay may like Omega Labyrinth, but the death system (where missions must be completed in one go) and limited item capacity were criticized as too difficult and too frustrating, respectively. The game was compared to the Senran Kagura series by Sato of Siliconera.