Hana Yurimoto

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.

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At a speed-dating event, Taika hits it off with a woman named Ayano, a doctor who’s eager to have children. However, just as the matching couples are about to be announced, he panics and makes a break for it when his fears about his erectile dysfunction begin to surface... Later, at an appointment for his condition, Taika is shocked to discover that his doctor is none other than Ayano herself! On top of that, he realizes that when he's with Ayano, his erectile dysfunction disappears! This is a story about two people who decide to enter into a secret contractual marriage with one goal, to have a child in less than a year!

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