Hirasaka Hinako Ga Ero Kawaii Koto Wo Ore Dake Ga Shitteiru

Briefly about Hirasaka Hinako Ga Ero Kawaii Koto Wo Ore Dake Ga Shitteiru manga:

Akira, a boy who gave an old woman a handkerchief soaked with his drool, in exchange for her agreement to help him make his high-school crush Kaho fall in love with him, is now 16. A year has passed since he graduated from middle school with Kaho and several months since they promised the witch that they would keep loving each other forever. Then one day, Akira sees Kaho on the train platform by chance. She's returning from Tokyo, working as a model for Fumiyo Konno's gravure photos.