I cant find but Im sure there was a scene where Kabuto chases an Anbu and that Anbu commits suicide or something like that

Does anyone know the ost in episode 80 that starts at around 3:05, the guitar rift, you hear it again in episode 85 and I was wondering what the ost is

The song plays at about 18 min into the episode.

In this anime(or manga ıdk), a girl is loved by everyone. She's nice and smart. But in home, she is really messy and also she is an otaku. Then a boy from her school finds her secret. I'm sorry If my english is bad ^^' I hope someone can answer me >-<