Ittou Asanuma is a first year student at Moto-Azabu Private High School. He is good friends with Makoto. Ittou admires Mamoru a lot, he believes that Mamoru is perfect, that he's the smartest student in their school, good at sports and really nice to juniors like himself. Ittou wants to be just like Mamoru one day.
Ittou overhears Usagi and Mamoru's conversation about Ami and Rei being missing and hears Luna talk. When Makoto is weakened by the virus being spreed by Petz, Ittou looks after her, and learns her true identity as Sailor Jupiter. He wants to protect Makoto and says he won't tell anyone her secret.
Has golden blonde hair and blue eyes.