Un jeune homme du nom de Iwase Ken, obstiné et pitoyable en amour tombe amoureux de Yoshida Rei, son amie d'enfance, mais elle n'en sais rien et se marie avec un autre homme.

Lors de la cérémonie de mariage, une fée apparait et permet à Ken de retourner dans le passé, lui donnant une seconde chance de conquérir le coeur de Rei.

A comical and heartwarming drama about a university lecturer on animal behavior who just loves all living creatures. Once he starts thinking about them, he becomes too absorbed to care about anything else! People think he is quite odd and eccentric! But gradually his attitude, free from restrictions of rigid common sense and social norms, changes the way of thinking of those around him. They can recall a time when they, too, were engrossed in something they loved.