Kokoro's Adventure vol.1:road to kokoro

A boy called "Kokoro" just moved into Darkberry town . His parents Signed him up to Darkpine highschool. He finds out in the the basement that there is a group of people in black hoods that tells kokoro that they are monsters that attack the city and the city's strongest team is getting tired and lazy. So they tell him to go to the cave near Darkberry park and tells him to find a sword that is special and it was called "Greensaber sword" to knock the monsters out. He needs to destroy them all even the guards and the monster king.