The most serious class president girl of school loves his old man teacher who is about to retire. Hana Shiratomo.

Ever since I can remember, I've liked men who are as old as my father. His father was strict and unfriendly. He may be the reaction. My homeroom teacher, Mr. Sayama, is kind and his worn-out expression is irresistibly cute. She wants to marry her teacher...she doesn't need anything else.