Sweet Pool is a visual novel game released in 2008 that was produced by Nitro+chiral. It was illustrated by Kurumazaki Mayuki.
Youji is a little bit nervous because he goes to school for the first time in several months. From that day, his surroundings gradually change.... Tetsuo unexpectedly approaches Youji. Youji asks Tetsuo why, but he never answers.... Youji gets scared of Tetsuo. Zenya also approaches Youji at the same time. One day, Zenya suddenly whispers Youji, "It's all your fault...." Strange pain.... Vivid nightmares.... Are they just illusions? What are Tetsuo and Zenya's purposes?
Disclaimer* Quote taken from The Visual Novel Database
This visual novel has a unique choice system based on reason versus instinct, and there are six endings to this eerie story
A quiet, sickly high school student, who was held back a year due to his hospitalization.
Voiced by Haruno Kaze.
Youji's mysterious classmate.
Voiced by Hatoman Gunsou.
Youji's classmate and only friend, who had an obsession with food.
Voiced by Sorano Taiyou.
A strange upperclassman Youji meets when he is playing around on the gates.
Voiced by Midorikawa Hikaru.
Zenya's driver and butler. He is completely devoted to Zenya and to his father Kunihito.
Voiced by Akizuki Hideyuki.
Former Yakuza Boss in poor mental condition. He is Zenya's father and Kitani's boss and mentor.