Satsuki Inanae

Satsuki is Akiras childhood friend and his classmate. She believes that she is like an older sister to Akira. She calls Akira quotAhchanquot which he seems to dislike. She eventually awakens to her powers as the shiki tsukai of May in third volume of the manga. On volume 4 she has finally become a full flege Shiki Tsukai of May wielding the May 5 Red Coral shikifu. Wikipedia