Professor Shibamata Friends

Haruka Minagawa is a cousin of Youichi Shibamata who is his first young love.

Karin is the hyper, tom-boy robot created by Ittoku Shibamata that was sent to care for Youchi with her sisters Mitsuki and Kirara.

Kirara is the kuudere, loli-goth robot created by Ittoku Shibamata that was sent to care for Youchi with her sisters Mitsuki and Karin.

Mitsuki is the shy, glasses-girl robot created by Ittoku Shibamata that was sent to care for Youchi with her sisters Karin and Kirara.

Raika is a ninja-type robot created by Ittoku Shibamata that was sent to care for Youchi.

Robo-Haruka is a robotic copy of Haruka Minagawa created by Professor Shibamata. Though a twin for the original, Robo-Haru-chan is far more outgoing.

Youichi Shibamata is the grandson of the famous Professor Shibamata who becomes the caretaker of his grandfather's three robot girls.