Ainosenbiki ~Mama Katsu Shitara Mama ga Dekita Hanashi~Ai no Senbiki ~Mamakatsu Shitara Mama ga Dekita Hanashi~; アイノセンビキ～ママ活したらママができた話～; Ainosenbiki: A Story of Getting a Mommy After Doing Sugar Mama Dating; 愛的境界線; 爱的境界线

The protagonist is a middle school boy named Hikawa Jun who lost his mother at birth. He glares at his classmates who complain about their own overprotective mothers and wonders what it would be like if he had a mother of his own. The story begins when Jun, who wants the warmth of a mother, lies about his age and matches up with a stranger on a sugar mama dating app.