Hello, pretty desperate to know where this scene from my memory is from. Maybe a mystery crime keiji dorama, movie, manga or novel even. Since it might be from a manga, im posting here too

What I can recall is there's a high school/college guy who is always getting bullied by a group of male peers (one of them is their parents' boss's son). He always studies at a family restaurant where he got to know a waitress girl. He gifted her a keychain that can record sound. One day, the girl was kidnapped by the group of bullies. The boy (or his mother) has rented an apartment for studying but unknown to him, the group of bullies used the apartment to confine the girl and torture her. The girl jumped out of the window to escape after a few weeks.

These are the part that im not sure of: The boy went to check the apartment and as he was leaving, he witnessed the girl jumping out and died. The bullies pushed the blame to him and escaped scotfree while he was jailed (?). In the end, the detective (or someone) gave him the same keychain the girl had that proved his innocence (she recorded her words: although this is his apartment, he was never here at all.)

Do comment the possibilities. Thank you