Synopsis

Makoto Ozaki’s first year in high school is uneventful, filled with small embarrassments like bullies, untrustworthy friends, and an overwhelming teenage desire. However, everything changes when a pale, skinny girl attacks him in an alley and gives him a choice. Now, everyday life is dramatically different. The day feels extremely bright, food tastes terrible, and the worst part is an unbearable thirst. The petty embarrassments of his old life have been replaced by two huge problems: the truth about what can quench his terrible thirst and high school itself.

(Simplified version from Kodansha USA)