Chimoguri Ringo to Kingyobachi Otoko

A high-schooler searches for a way to restore his little sister after a fishbowl-headed man transforms her into a goldfish. When the creature attacks, a goldfish leaps from its bowl and drinks the victim’s blood, causing the irreversible change. Kousuke does his best to care for his sister in her new form. He meets Ringo, a strange girl in a school swimsuit who carries an umbrella and wears a gun around her neck. She is an apprentice blood diver, using the gun to shoot herself into victims’ wounds and stop them from becoming goldfish if she arrives in time. Ringo’s mentor, Ichigo, has heard of a way to turn goldfish back into people. Kousuke is determined to help Ringo find it for his sister and the loved ones of his school friends who have suffered the same fate.