Takahisa is the main protagonist of Kichikujima debuting in the first volume of Kichikujima. He was apart of a group of university students that does research joining because of his unrequited crush on a girl named Yuka Uehara. After setting foot on an island with The Family and later the archbishop he was granted powers and had become insane while also dealing with Mari the oldest daughter of the family who develop feelings for him.