He loves arcade games. He is a classmate of Keita and Aguri's boyfriend. Tasuku is shown to be a good friend as shown when he decided to set Keita up with Karen due to seeing her behaviour towards him. He even introduced Keita to Chiaki to practice talking to though his actions were a bit too involved as it prevented him from being with his own girlfriend.

He was a gamer similar to Keita and was mocked because of his nerdy behaviour. To vent his frustrations, he'd go the arcade and play games. Reaching a breaking point with his nerdy self, he decided to reinvent himself before high school. He changed his hairstyle and appearance becoming a popular boy in his new school.
(Source: Gamers! Wiki)