In the back of the forest lives Allen, the people-hating wizard. He is feared by the people around him and called the "Demon Lord".One day, while living out his life as a hermit, he finds a young girl named Charlotte who collapsed. Although innocent, she was accused of evil wrongdoings, had her engagement broken and was forced to flee her country.Upon hearing that, Alan recalled the bitter experience of being betrayed by a party he once believed to be his companions. Hearing the story of the 17 year old’s exploitation, Alan decides, “I'll let her live in my mansion, and I'll teach her all sorts of bad things…"

Koyuki Shirogane, a girl known for her beauty and equally harsh tone, giving her the nickname "Venomous Snow White," is saved by Naoya Sasahara as a man tried to hit on her. She may try to act strong, but on the inside, she is merely a young girl. Having been saved by Naoya, Koyuki falls for him, and Naoya on his end falls for Koyuki's innocent and cute attitude. Both fail to be honest with each other, but eventually bring themselves closer to admit their feelings for each other.

In the back of the forest lives Allen, the people-hating wizard. He is feared by the people around him and called the "Demon Lord". One day, while living out his life as a hermit, he finds a young girl named Charlotte who collapsed. Although innocent, she was accused of evil wrongdoings, had her engagement broken and was forced to flee her country.Upon hearing that, Allen recalled the bitter experience of being betrayed by a party he once believed to be his companions. Hearing the story of the 17 year old’s exploitation, Allen decides, “I'll let her live in my mansion, and I'll teach her all sorts of bad things…"