I met my childhood friend again, and she had become a beautiful and innocent-looking girl. *"It's been a while, Hayato." "Haruki, is it?"* In the past, I used to play in the mud with my childhood friend in the countryside. When I saw her again, there was no trace of the bratty boy I thought she was back then. But only in front of me will she drop her perfect facade and act in the same crude casual way she did before. The distance between us had not changed. (Source: Shousetsuka ni Narou, translated) *Note: Includes two extra chapters.*

I met my childhood friend again, and she had become a beautiful and innocent girl. "It's been a while, Hayato." "Haruki, is it?" In the past, I used to play in the mud with my childhood friend in the countryside, and when I saw him again, there was no trace of the bratty young man I thought he was back then. Only in front of Hayato, she threw away the coat she was wearing and reacted in the same crass way she did back then. The distance between you and me has not changed. (Source: Shousetsuka ni Narou, translated)

Kawai Yuuma had a childhood friend, Kuramoto Suzuka. She was a year younger than him, and also the little sister of his best friend, Akira. To Yuuma, she'd always been like a little sister, even as they were now in high school. That's what he thought, anyway... until one day, Akira fell for a senior at his part-time job. "That's insane," Suzuka scoffed, admitting she had no clue about romantic feelings. Yuuma himself had some baggage when it came to love, but he was curious about "that kind of thing." "I hear kissing feels good?" He knew it was wrong, but he couldn't resist crossing the line. They made a deal: this messy situation would only last until they found someone they truly loved. (Source: Gagaga Bunko, translated)

His step-sister Erika, whom he reunites with for the first time in seven years after their divorced parents reconciled with each other, and his childhood friend Mio, who feels like a close male friend to him despite being a girl. Katsuragi Shota ends up living under the same roof with the two of them. “...Is this what it’s like to be siblings?” “If we were really siblings, would we act like this?” The three of them, each having experienced loneliness related to family, find a comfort that feels more familial than that of strangers. However, to avoid romantic troubles at their high school, Mio and Shota decide to pretend to be a fake couple, leading them to unexpectedly become aware of each other as the “opposite sex”...!? As the three non-blood-related individuals search for a way to become a family, they navigate feelings that go beyond mere familial ties in this cohabitation romantic comedy.