The story centers on Kira Kiyoshi as well as a member of the only Japanese mafia on the island .
Kira Kiyoshi is an ex-Marine and manager of the Onsen Hotel on the island of Neon .
The story centers on Kira Kiyoshi , an ex-Marine and manager of the Onsen Hotel on the island of Neon , as well as a member of the only Japanese mafia on the island .