Tricked into believing his mother was on the verge of death, Haru Kaidou arrives abroad only to be suddenly introduced to his 'little brother' Ren.

Haru desperately tries to care for Ren, a feral child who refuses to listen to a word anyone says. But it appears there are secrets surrounding the circumstances of Ren's birth, and just as Haru finally gets Ren attached to him alone, a certain tragedy strikes.

Five years later, the now grown-up Ren arrives in Tokyo and is reunited with Haru. But something is amiss...

Ren Kaidou

Voice Actor: Junko Minagawa

The fourth son of the Kaidou family. However, he has absolutely no blood ties to Haru, Aki, and Shima. He was raised in a orphanage in Canada after being abandoned in a back alley when he was young. He was then taken in by Haruko.

Haru Kaidou

Voice Actor: Tomoaki Maeno

The eldest son of the Kaidou family. Raised in Canada until he returned to Japan at the age of eight, he is a quarter Japanese. His mother is Haruko. He is half-brothers with Aki and Shima, who have a different mother. A hard worker who loves people and is good at taking care of others.

Aki Kaidou

Voice Actor: Yoshitsugu Matsuoka

The second eldest son of the Kaidou family. Shima's elder twin brother. Has the same father as Haru. Energetic and quick to catch on.

Shima Kaidou

Voice Actor: Takuma Terashima

The third son of the Kaidou family. Aki's younger twin. Has the same father as Haru. Has a cool and collected personality.

Ikuyoshi Sasaki

Voice Actor: Ayumu Murase

Haru's former colleague from his host days. His professional name is 'Iku.' His family home is a farm.

Juuzen Kurosaki

Voice Actor: Jun Fukushima

Ren's classmate and friend at Souryou Academy. Speaks with a Kansai accent.

Natsuo Shiba

Voice Actor: Takuya Satou

A cousin on the Kaidou brothers’ father’s side. Works as a host under the professional name Natsu.