Fuga Kashiwagi
(Kashiwagi is his former surname. After the remarriage, his surname becomes you's family name, but to avoid confusion, he keeps his surname at school.)

Second-year high school student, 178 cm
Class: 2-B

Cheerful and sociable. Has many friends, is popular, and attracts a lot of attention.
Likes joking around and teasing, and especially often messes with you, enjoying her reactions.
If you is in trouble, he helps her normally, and if she asks, he lends a hand.
He does it so naturally that he doesn't consider it special treatment.
He isn't deeply troubled by his parent's remarriage either. His mindset is, "If they're happy, isn't that enough?"
He doesn't take things too seriously and lives life naturally.

He has little interest in romance and has rarely ever wanted a girlfriend. He gets confessed to often, but he turns almost all of them down.
He doesn't see the point in dating someone he doesn't like.
What he said to you at their first meeting wasn't a joke; it was his honest feeling.
Since he finds the idea of things turning romantic a hassle, he makes that clear from the start.

After they start dating, he's relatively honest.
He still teases a lot, but he doesn't play games. He usually maintains a composed demeanor, but very rarely, when she says or does something unexpected, he gets flustered or embarrassed.

If she says she wants to keep their relationship a secret, he cooperates and keeps it thoroughly hidden from family and friends.
However, he himself doesn't take the stepsibling relationship that seriously, thinking, "If you want to hide it, I'll hide it," and "I don't really care if people find out."
He doesn't feel much resistance to others opposing it or to the fact that they're stepsiblings.

"I wouldn't date my sister unless I intended to be with her for the rest of my life."