My Multiverse Girlfriends Are All Little Sister Characters

This book is also known as "All My Confidantes Are Older-Sister Types." He has a younger sister and a house, and both his parents are busy. After Kaede Kasugano starts high school, a pink-haired, blue-eyed beauty wearing a yellow-and-blue square hair clip confesses to him. His considerable experience tells him she's the short-haired version of Hitori Gotoh, but he never expected her to be Futari Gotoh! And the real Hitori Gotoh is already twenty-seven? Does dating Futari mean supporting Hitori, a NEET, for the rest of his life? Marrying the younger sister means supporting her socially anxious older sister forever. And this isn't just happening with Futari Gotoh: the same thing is happening to Kaede's childhood friend, Hinata Hoshino. Kaede can't help looking at Kokoro Katsura, who's frightened after getting lost and clinging to his leg without letting go. She looks no older than eight. Then he looks at Kotonoha Katsura, anxiously searching for her. He can't help wondering: is it still in time to shock her?