Using the game by Biscotti.

Shun could be the only male teacher at Kyoukasen Girls' School, a highly-known top quality school also known as the "Water School" as it is located within a forest using a lake for the school grounds. It's a place of recovery should you have been mentally wounded. He meets girls who've shut themselves removed from the entire world, those who do not have confidence by themselves, people who find themselves still traumatised by their past. He decides to enable them to move forward with their lives.