Toilet-Bound Hanako-Kun Vol 1

Toilet-Bound Hanako-kun by AidaIro. A Shonen manga rated Teen, published in English by Yen Press.

Nene Yashiro hears a school legend that Hanako-san, the ghost of the third-floor girls' bathroom, will grant your wish. She summons him in hopes of finding love, only to discover that Hanako is a boy, and that his help comes at a price.