AiON: Volume 1

Tatsuya Tsugawa loses his wealthy parents in the middle of high school. Trying to fulfill his fathers dying wish of him becoming an upstanding man, Tatsuya attempts to save a girl from obsessive bullies only to be consumed with an obsession himself. But what will Tatsuya do when his good will and earnest efforts lead him into a twisted fantasy world infested with mermaids and mind-controlling parasites?