Keiichi Wakaouji

若王子 圭一, Dr. Wakaouji

Mitsuki's doctor. A kind, caring and easily flustered man. He takes on a role close to a second father for Mitsuki.

It is revealed later in the series that he is a former band member of "Route::L". At the start of the series he has given up music, but he later returns to the music business in order to find the missing Mitsuki, and becomes Fullmoon's producer.

In the manga, he falls in love with Ms. Oshige, and the two are married by the end of the series.