Natsuno Ai

Shinji's older sister. Her grandmother, due to back pain, gives her coffee shop to Ai.

A tall and lean beauty, she is popular betwwen both sexes. A superb brocon she is, but rather shows her love for the protagonist through pranks. She jumps at every chance to start a phiycial relationship with him. The desire for monopoly was quite strong.

She is suspicious that Shinji is dating Shigure. In order to take back her precious brother and to get rid of his interest in other women, she is going to make him crazy about her by educating and managing him.