Yūta Igarashi

The story centers on a pair of stepsiblings. When Kōta's father gets remarried, Kōta's first impression of his new stepsister Aika is that she is beautiful, but that image is shattered pretty quickly. His new stepsister is a super sassy and foul-mouthed gyaru who behaves uncontrollably while their parents are away, making Kōta's life a living hell. However, their relationship begins to change when Aika gradually warms up to Kōta's caring older-brother nature.

Two months into their relationship, Yui and Naoya are still adjusting to life as a couple. Everything changes when Yui unexpectedly reunites with the man who was her first sexual partner. Threatened with having her past exposed, she is forced to keep a painful secret from Naoya, putting their relationship and her feelings to the test.

The story centers on a pair of stepsiblings. When Kōta's father gets remarried, Kōta's first impression of his new stepsister Aika is that she is beautiful, but that image is shattered pretty quickly. His new stepsister is a super sassy and foul-mouthed gyaru who behaves uncontrollably while their parents are away, making Kōta's life a living hell. However, their relationship begins to change when Aika gradually warms up to Kōta's caring older-brother nature.

Two months into their relationship, Yui and Naoya are still adjusting to life as a couple. Everything changes when Yui unexpectedly reunites with the man who was her first sexual partner. Threatened with having her past exposed, she is forced to keep a painful secret from Naoya, putting their relationship and her feelings to the test.