吉永 良太

The protagonist of the story. Ryouta is the nephew of Kaori. He is cousins with Sena, Kana, Mana.

His father was transferred overseas for work reasons, and his mother went with him, but was worried with leaving him alone and sent him to stay with his relatives, the Okano's.

He is an only child and has never lived with a girl other than his mother. He is happy to have older sisters but the excessive skinship and life of servitude has caused him trouble.

From official site.