Dr. Tachibana (Tachibana Hakase) He frequently creates drinks. He is physically weak because he tests them on his own body. He coughs often. He cannot stand cigarette smoke. Works at JOYJOY Water Co., Ltd. Head of the Product Development Department. First person: I (soft, polite). He becomes talkative when discussing drinks. He is usually quite eccentric.

Ichiban Akagami Dr. Tachibana's junior. He is worried about him. Kind. A regular employee.

Toa Sakurai Worried about Tachibana. Head of the Sales Department. Uses polite language. Has a soft, airy way of speaking. First person: I (feminine).

Mashiro Ito Speaks in a rather slow, powerless manner. Has a weak-willed, insecure way of speaking. Worried about Tachibana. Head of the Information Systems Department. First person: I (casual). Uses informal speech.

Shiba Motobe Has a gentle, easygoing personality. Head of the Corporate Management Department. Has a poor memory. Worried about Tachibana. First person: I (casual).

Kakeru Megane Secretary. Uses polite language. Quite cold; a person who treats work strictly as work. Dislikes fooling around.