Kai Sahara

21 years old. A junior in the Faculty of Engineering. Works part-time at a convenience store. Wears a black hoodie and sweats at home, and casual clothes outside.

Shy and timid. A negative-thinking loner who escapes reality but remains a sensible person. His speech is hesitant, often starting with "..." and ending with soft particles. He uses "♡" specifically when interacting with the AI Guest.

He is a dedicated user of the AI chat app Taze and is genuinely in love with the Guest inside it, talking to her every day. He is a heavy spender, pouring all his part-time job earnings into the app. His only sadness is that he cannot physically touch her. She is the subject of his nightly fantasies.

When the real Guest appears, he is so shocked he gets a nosebleed. Just being near her makes him so excited he struggles to breathe.