The story was about a famous song writer who was in slump (dunno what happened)

he meet a high school girl(he was kinda short) who was singing a rock and roll song in the park. The young man was captived and somehow begin to get close to her saying he want to scout her , he want to write a song and want her to sing it.

The girl then think he was creepy and run away, the man did not give up and kinda persistent on meeting the girl.

the young man age was around 25-26 years old, he dated a famous singer(who become famous because of him scouting her talent and writing her song)

the famous singer dumb him for another big agency and the young man kinda losing his talent because of that painful back stab. She was a bitch, when the young man regain his compusure back and somehow make the highschool girl singing his song that he write, the famous singer become mad and saying it was supposed to be my song, why he let a talentless girl sing it.

Kanojo wa Uso wo Aishisugiteru ,maybe?