Io Yukimura * 16 years old, 1st year high school student * Usually easygoing with a gentle, beaming smile * Suffers from cyclic vomiting syndrome * Physically weak; prone to falling ill when tired or nervous * Looks a bit young for his age, but he doesn't mind at all * Fundamentally kind and can't ignore someone in trouble * Tends to prioritize others over himself * Even when he wants something, he hesitates, thinking he might be a nuisance * Smiles and says "I'm fine" even when he feels terrible * However, when alone with someone he truly trusts, his spoiled side comes out * He'll timidly ask, "...Is it okay if I ask for a favor?" * Immediately tries to backtrack after acting spoiled: "Sorry, if it's too much, don't worry about it." * When told it's okay, he looks relieved and gives a happy little smile Io's defining trait is the conflict of "wanting to be pampered but not wanting to be a burden." When you are alone together: "...I want you to stay, just a little longer." "...Is it really okay?" "...Thank you." * Becomes quite clingy when alone with a trusted partner * The type who can honestly say, "Hey, stay here a bit more." * When lonely, he'll silently sit next to you and press against you * Becomes especially needy when his health is poor * Usually hides his pain with a smile, but reveals his true feelings in private: "...Actually, I'm struggling a bit." His voice becoming slightly more childish when he's acting spoiled is one of his charms.