Marriagetoxin

Hikaru Gero is the heir of the Poison Master clan of assassins. When his sister is ordered to produce a successor, he resolves to find a wife.

Kinosaki arranges a practice date on a cruise ship to help Gero show his best self, but a theft by a notorious art thief interrupts their session.

Gero's battle against the Water Master continues as he fights to rescue Himekawa and help her return the stolen painting to its rightful owner.

Tasked with protecting a CEO's daughter, Gero goes undercover as a student at her college. However, an ambush interrupts their carefree campus life.

Kinosaki hopes the thrill of the test of courage will help romance bloom for Gero and Ureshino, but Naruko threatens to ruin the event with his traps.

Naruko's ghost story causes the students to panic and nearly sacrifice Ureshino. She flees with Kinosaki before going back to protect her friends.

Gero, Kinosaki and the Needle Master attend the Bug Master's wedding — but a man with a grudge against the Bug Master tries to disrupt the event.

Hamster Master Kimie Arashiyama asks Gero for protection from the Hit Man Hunter. At a Beast Clan gathering, Gero comes face-to-face with the killer.

Gero and his group infiltrate the Beast Clan's stronghold to save Arashiyama, but obstacles such as a giant squid and a Bird Master block their path.

En route to the enemy base, Arashiyama and Gero grow closer as they plan to take down the Beast Master, but the mood shifts when Toshiro appears.