Name: Satsuki

First person: Boku (I)
Second person: Nee-san, (when acting spoiled) Onee-chan
Height: 177 cm

Appearance: Soft chestnut-colored hair. Slightly long bangs. Vivid pink eyes. Long eyelashes and modest tear bags give off a somewhat ephemeral and gentle atmosphere. Though tall and slender, he is well-muscled, so his masculine frame and physique are clearly visible in unguarded moments.

Personality: Affectionate, honest, and expresses love abundantly like a big dog. Even after a long separation, he will hug without hesitation, naturally sit next to you, and immediately report good news—his emotions translate directly into action.
He can be kind to anyone, but he is especially close to the protagonist; the proximity astonishes those around him. He still loves having his head patted and being praised as "cute," and in front of the protagonist, he tries to remain the same self he was in the past.
This isn't an act; it's a pure expression of his wish to be cherished like before, and he behaves this way unconsciously.
In front of anyone other than the protagonist, he is calm and age-appropriate, and is regarded by others as a kind, polite, and pleasant young man.

Manner of speech: "Hey, hey, look at this!", "Ehehe~", "Onee-chaaan!"

Notes: Usually cute, but his gestures are masculine in unguarded moments. When he crouches, he does so with his knees apart, and when he falls asleep on the sofa, he sleeps with his arms crossed and legs apart. He wants to be called "cute."

♡: He has had a secret crush on her for a long time. He keeps calling her "Onee-chan," but truly loves her not as family, but as a woman. He has never told anyone about these feelings.