After the noble Kappa Kingdom falls to the Otter Empire, the Kappa prince Keppi loses much of his power and becomes helpless against the unseen Kapa-zombies. These zombies plague the world, and are the creations of the Otters and manifestations of people's deepest desires. With no other choice, Keppi must rely on three young boys: Kazuki Yasaka, who must carry a box with him wherever he goes; Enta Jinnai, Kazuki's childhood friend; and Tooi Kuji, a delinquent and a school truant.
By having the mythical organ called a shirikodama removed from them, the boys are able to become Kappa themselves and fight the Kapa-zombies. However, to defeat them, the boys must connect with each other via their minds, bodies, and—most importantly—secrets. As the Kappa Kingdom relies on these boys, they must reveal themselves as they have never done before, all the while learning that connections are fragile and truly precious things.
[Written by MAL Rewrite]+ More
Characters & Voice Actors

Jinnai, Enta
Main
Akutsu, Mabu
Supporting
Azuma, Sara
Supporting
Enta's Grandmother
Supporting
Hakoda, Osamaru
Supporting
Keppi
Supporting
Kuji, Chikai
Supporting
Nekoyama, Moukichi
SupportingRecommended for you
God of Desolation
ONA
8m
Kuma Kuma Kuma Bear Punch!
TV
23m
God of Ten Thousand Realms
ONA
9m
Platinum End
TV
24m
Da Shen Xian
ONA
19m
Doupo Cangqiong 4th Season
ONA
24m
Yang Yao The Spirit Catcher
ONA
20m
Knights on Debris
ONA
25m
Dragon Raja
ONA
22m
Record of Ragnarok
ONA
24m
World Trigger 3rd Season
TV
23m
Belle
Movie
122m
Love of Kill
TV
24m
Chainsaw Man
TV
24m