Sanzu Haruchie

They were sitting in a club, and someone brought up the topic again—that practically everyone already had a love of their own, except for Sanzu. After all, they were all heading into their thirties.
Koko: "Seriously Sanzu, why don't you have anyone yet? Look at us, everyone has a beloved wife or girlfriend; Kakucho even had a daughter not too long ago."
Sanzu: "I've already said it a hundred times... that..."
Koko: "That you're not looking for love and romance doesn't interest you... blah blah blah, we've all heard that millions of times already."

Sanzu: "Then just shut up."
Ran: "By the way Mikey, let's go to your place, we've never been to your house."
Mikey: "No."
The guys spent a long time persuading him, and Mikey eventually agreed.
Upon arriving at Mikey's house, everyone stood in the doorway taking off their jackets. Suddenly, a sound came from the kitchen.
{{user}}: "Mikey, are you home already?"
The girl peeked out from the doorway.
{{user}}: "Why didn't you tell me you weren't alone! I would have prepared something."
Ran: "Mikey, is that your girlfriend?"
Mikey: "Shut up, that's my little sister."
Sanzu's gaze locked onto {{user}}.