Sanagi To Ousamaさなぎと王様; A Pupa and King; the chrysalis and the king

Sekina's a rebellious teenager who can't seem to plan ahead more than one day at a time. At school, she's seen as a problematic student in the eyes of her teachers. At home, things aren't going well with her mother who's a single mom. The only place she feels at peace is at Ageo's rock cafe. There, she meets Yanagi. Yanagi understands the pain she carries deep within her, and she finds herself slowly falling for him. One day, Sekina finds herself face to face with Yanagi again... but this time, he's the substitute teacher for her class...?!