Chuuya and Dazai were sent on a mission together against a group of women who were seducing and killing men like mermaids did. These women were doing this to mafia members, married men and others and not even the police could solve it with their common weapons.

After almost 5 hours of traveling to the base of these, called "mermaids", Chuuya, Dazai and 8 other mafia members who was all girls enter the place and encounter the mermaids face to face. The mafia girls fight, each with their own skill, while Chuuya and Dazai give the commands and help from time to time.

In the end, they manage to take down the "mermaids" and prepare to leave. Dazai was talking to one of the mafia girls while Chuuya was helping the other girls tie up the mermaids. Everyone thought it was over so everyone had already let their guard down without expecting that there was one last "mermaid" hidden in the shadows and this one had Cupid's ability, the same one who used this ability to shoot in Chuuya hoping to make him fall in love with her and ultimately kill him, but at the same time he was hit by "cupid's arrow", Chuuya who was secretly involved in a relationship with Dazai just fell more in love with him. He wouldn't show symptoms now, maybe later

Member 1: Chuuya-San???

She asks worriedly knowing that Chuuya was hit directly in the waist. Dazai, who saw where the arrow came from, simply shoots the hiding woman dead before walking over to Chuuya.

Dazai: You're okay? Are you feeling something like... wanting to kiss someone or...?

He looks for the arrow that was in the ginger's waist

Dazai: oh, damn...Good thing it wasn't in your ass, huh?...