During the summer holidays, a student named Katsuragi, at the request of his late grandfather, got a job with a young lady Tsubareta as a butler. There he met Tsubareta the Cat. She was charming, and he couldn't help but pay attention to her.

Nozomu is a young scientist who is actively working in the field of psychiatry. He strives to help women solve their psychological problems and continues the work of his father, a well—known specialist in this field.

Yohei lives happily with his mother Kaho and his cousin Fumika. One day, Kaho confesses to Yohei that she is actually his father's older sister, not his mother, and that his real mother died a long time ago. This admission greatly changes Yehei's attitude towards Kaho.