Harada is a successful scenario writer, and his best buddy has just announced an intention to propose to Harada's ex-wife. Recovering from the shock, Harada indulges in melancholy, mainly on his failure as a husband and father, and goes to a 'Rakugo' show, where a friendly man in the audience invites him home. Harada is puzzled at the strong resemblance of this man and his wife to his own parents, who were killed nearly 30 years ago when he was twelve.

A bad day gets worse for young detective Murakami when a pickpocket steals his gun on a hot, crowded bus. Desperate to right the wrong, he goes undercover, scavenging Tokyo’s sweltering streets for the stray dog whose desperation has led him to a life of crime. With each step, cop and criminal’s lives become more intertwined and the investigation becomes an examination of Murakami’s own dark side.

A new Mothra takes to the air and battles against Desghidorah to save all of humanity.