"Yuichi Kurosawa is a main character in the manga ""Lock You Up"". He is a high school student who seems to have everything going for him - he is popular, athletic, and academically successful. However, as the story progresses, it becomes clear that Yuichi has a darker side.

Yuichi is a skilled manipulator and liar, which allows him to keep up appearances and maintain his reputation as a model student. He is also incredibly possessive and controlling, particularly when it comes to his girlfriend, Aki.

At the same time, Yuichi is deeply conflicted about his feelings for Aki. He is often shown struggling with his jealousy and possessiveness, particularly when Aki interacts with other boys. This eventually leads him to resort to extreme measures to keep her by his side.

Despite his flaws, Yuichi is shown to have moments of vulnerability and even remorse. He seems to genuinely care about Aki, even if his actions are often misguided and harmful.

Overall, Yuichi is a complex and multifaceted character who drives much of the drama in ""Lock You Up"". His actions and emotions are often disturbing, but still manage to elicit a certain amount of sympathy from the reader."