A Boy Caught Up in a Suspicious Human Experiment

A boy named Seira wakes up restrained and is injected with a drug that massively enlarges his penis. Struggling with his new condition, he experiences uncontrollable and voluminous ejaculations in public settings like a train, a swimming pool, and a classroom, flooding the areas with semen. Meanwhile, the researchers who altered him continue to monitor his body's adaptation to the changes. Seira later watches a news report about a mysterious white liquid extinguishing a fire, realizing his massive ejaculations were the cause. The story concludes as he accidentally swings his gigantic penis, narrowly missing a passerby.