Roku Hasegawa

After a life-changing incident, timid college student Koichi Haimawari accepts an offer from revered vigilante Knuckleduster to train as his protégé.

Once upon a time, a mermaid princess named Lara fell in love with a human prince. To be with him, she used a witch’s potion to become human—but the magic came at a cost: If she failed to find true love, she would vanish into sea foam forever. Now, 200 years later, Lara awakens in Lake Biwa with one final chance at life and love.

The best hotels must meet certain standards, including the finest cuisine, ways to relax, and entertainment. Of course, they also need the best selection of weapons, reliable ways to falsify one's identity, and ways to dispose of evidence. In this hotel at the border of death stand two concierges, Ikuro Hoshi and Sara Haizaki. What kinds of requests will the assassins have for them next?