میتسیومیونای ساکای

Mitsumune is an alias that the main character used for the online website.

[Spoiler: However, Mitsumune is also his real name; his full name is Mitsumune Sakai (酒井 光宗).]

Mitsumune is shown to be awkward around girls, and says he is "quick to fall in love." He is shown to have a righteous personality, and portrays his ideals clearly. His age is not specified yet, but it is shown that he is currently at an age to be in cram school, so he is likely in his young-adult to older-adolescence years.