1+2＝Paradise is a Japanese manga series by Sumiko Kamimura. The story has been adapted into two original video animations (OVAs) released by Toei Video, a subsidiary of the Toei Company.

Mitsuo Yamaguchi , better known by his stage name Kappei Yamaguchi , is a Japanese actor, voice actor, and rakugoka affiliated with Gokū and 21st Century Fox. After making his voice acting debut in 1989 as the male version of Ranma Saotome in Ranma ½, Yamaguchi went on to other notable roles, including Inuyasha in Inuyasha and L in Death Note. He currently voices Shinichi Kudo and Kaito Kid in Detective Conan, Usopp in One Piece and Teddie in Persona 4. He is married and has a son, Ryunosuke, and a daughter, Akane. Ryunosuke and Akane are also voice actors, while the latter is also a rakugoka.