East Shinjuku Night High School has students with various challenges. Delinquent Taketo is trapped in a negative spiral. Filipina-Japanese Angela struggles with schoolwork, while Kasumi spends all her class hours in the infirmary. Shozo had to leave school to work in his youth. With guidance from their new science teacher, Fujitake, they work on an experiment for an academic conference.
Makoto is a student at an art university. She was once captivated by her art class teacher, Ira when she was just 12 years old. Ira vanishes from the scene and, not until six years later, appears before Makoto at an art exhibition. Surprisingly, she looks the same as Makoto remembered and has a secret to hide. Although still human, Ira seems to have a thirst for blood.
The story takes place during a summer of continuous sunshine when water supply restrictions are issued in the city. Shunsaku Iwakiri works for the city's water department and his job is to visit homes and stores that are behind on their bills and either collect the money or shut off the water supply (water suspension enforcement). Shunsaku is separated from his wife and children, and his heart grows thirsty as he spends his days visiting poor households and being abhorred. One day, during a water shutoff, Shunsaku meets two young sisters who have been neglected. He sees them as his own children and offers them a helping hand.