Papa's Assasin. - Ryuunosuke wa Tonde Yuku.パパ’Sアサシン。~ダニエルは飛んでゆく。~; パパ’sアサシン。~龍之介は飛んでゆく。~ (Japanese); 爸爸的暗杀者 (Chinese); Papa's Assasin (English); Papa's Assasin - Ryuunosuke wa Tonde Yuku; Papa's Assasin. ~ Daniel wa Tonde yuku.

Ryuunosuke, a high school student, lives with his annoyingly popular father, Daniel. Though Ryuunosuke is unaware of this, he was actually handed off to Daniel when he was three years old by a random woman. Ryuunosuke has several good friends and in general spends his day happily, but he has a Secret that he's keeping from Daniel... What could it be?