Yasashii Akuma

Wataru and Tohko were pals in their youth. Because Wataru was a bit of a wimp, Tohko had to shield him from bullies at all times. After that, he relocated to Germany with his family, and they stopped communicating with one another. Years later, Tohko is in her second year of high school when Wataru comes back to Japan for his first year of high school. But now he's entirely changed from how he was before, becoming much more assertive and aggressive and growing incredibly tall for his age. He constantly orders Tohko around, and she even finds up having to make his lunch every day, but she is unsure of how to handle the "new" Wataru. When they were young, he seemed like an angel to her, but now she sees him as a demon.