Tooru grew suspicious when his nephew went missing and only deepened upon meeting Koushi, a Bunny Hybrid, in the same day. whose presence seemed off. Their friendship revealed Koushi's true nature, which caused Tooru to fall for him. Shortly after, Tooru told him about his nephew, to which caused Koushi to do some searching of his own.

One day, while Tooru was out, he received a distressing alarm from home, where Koushi stayed, prompting him to rush back to find the utter chaos before him.