Shiratori Sakuto is 28, but has the intelligence of a 6-year-old boy. He
works for Dream Flower Service, a flower distribution centre which
provides employment for problem youth. One day, he and a colleague,
Yanagawa Ryuichi, delivers a rose bouquet to the apartment building
where Mochizuki Haruka lives. Because Haruka does not know that the
deliveryman is mentally challenged, she is shocked by his response and
tries to call the police. Haruka works for a brain physiology research
centre where Professor Hachisuka Daigo has been studying the improvement
of mental performance. He has succeeded in lab experiments on a white
mouse called Algernon. Sakuto is transformed into a genius through
surgery. But Algernon s new intelligence begins to fade, and he dies.
Sakuto realises that his genius, too, is destined to leave him.