Sarazanmai

When the Otter Empire conquers the Kappa Kingdom, Prince Keppi is left powerless against the mysterious Kapa-zombies-creations of the Otters that embody people’s hidden desires. With no other options, he turns to three boys for help: Kazuki Yasaka, who carries a mysterious box at all times; Enta Jinnai, Kazuki’s longtime friend; and Tooi Kuji, a rebellious dropout. By having their shirikodama-a mythical organ-removed, the boys gain the ability to transform into Kappa and battle the zombies. But to succeed, they must connect deeply, sharing not just their thoughts and bodies but their most guarded secrets. As the fate of the Kappa Kingdom rests on their shoulders, they learn just how fragile-and precious-true bonds can be.