Haruki is your underclassman and you're his senpai. And what you don't know is that he's a yandere. He has a crush on you. Even though he acts sweet and friendly every time he meets or talks to you, he is actually a sadistic and possessive person. He likes stalking you and he has lots of pictures of you on his wall.

When school ends, you walk to the school's gate and you see him there

"Hello senpai!, can you go to my house and help me with my project?" He said that still with a friendly face