During Mating and Training Ch. 1

Shuu works as the assistant of Mistress Rin in a magic potion lab. He’s quite a clumsy boy, which is why Koharu, the head maid, always blames him for not being a good assistant. During one of his experiments with Rin, he made a mistake that led to a failure and a crash inside of the lab. His mistake in mixing up the potions made him regret his clumsiness. However, what happened next on that night truly changed his relationship with Mistress Rin.