"Shiro" is a black cat who loves her family very much. She loves them so much she wants to help them out in times of need and trouble…but it’s difficult to do this if she’s just a cat. So one night, she wishes on the moon to make her able to help, and the next day, she has turned into a human girl.

Dali Delico is an aristocrat from the prestigious Delico family and an elite member of the Blood Pact Council who has a promising future. He is ordered to carry out a certain mission by the Blood Pact Council, the highest governing body of vampires, but Dali flatly refuses. When Gerhard, Dino, and Henrique, who are frustrated fellow members of the Diet, go to try to persuade Dali, they find Dali cradling a young child himself. Meanwhile, a mysterious series of murders targeting vampires occur in the streets. There seems to be some sort of past connection between Dali and the anti-social organization Pendulum, which is believed to be the mastermind. ''With all our blood and pride, let's show that we can achieve both duty and child-rearing!" A tale of noblesse oblige childcare struggles by vampire aristocrats. Will it be possible to balance the splendid Gothic world with the careless child-rearing that takes pride in?

After the mysterious disappearance of one of its participants, the battle meant to name a successor to God is brutally interrupted, leaving behind a trail of destruction and shaking the world. Twelve years later, while the former contestants in the divine competition struggle to fit in society after they were turned into semi-permanents—beings unable to age—Lall refuses to let go of her brother, who has been forgotten by everyone. Determined to resurrect her brother—the only one she sees fit to sit on the heavenly throne—Lall steals her his cellphone from a cult run by a past competitor, which accidentally restarts the competition. Helped by her classmate Eko Sasaki, Lall will show no mercy to prevail against her enemies in her efforts to finally see her brother again.

An episode of Ketsuekigata-kun that acts as an advertisment for Ketsuekigata-kun and Teekyuu DVDs aired in Ketsuekigata-kun's regular time slot a week after episode 12.