Tsubomi is in her second year of high school and has a crush on her homeroom teacher. She plans to give her teacher a birthday gift, but unfortunately his birthday falls on a weekend... After finding out that her classmate Fuuma Yabuki is her teacher's cousin, she tried to get him to help her but despite being related to her homeroom teacher, who is nice and warm, Fuuma is very standoffish and doesn't want to help her out. Will this be the start or the end of Tsubomi's love?