Due to his indecise nature, Kyoichi, an advertising company employee, repeatedly cheats on his wife. One day, he meets Wataru, an old classmate from university. Wataru reveals that Kyoichi's wife hired him to investigate whether Kyoichi is having an affair. Wataru, who has liked Kyoichi for the past 7 years, takes advantage of the situation and blackmails the salaryman: if he accepts to have a sexual relationship with him, he won't tell his wife about his infidelity.

Taking place after the events of the TV series, Mitsuhashi and Ito face the new enemies.

When easy-going Aoyagi meets an old friend for a fishing trip, he ends up drugged, framed for the Prime Minister's assassination, and on the run from corrupt cops. It's only the beginning of what quickly becomes the worst, weirdest day of his life. But he'll get by with a little help from his friends, who include a famous pop diva, a rockabilly deliveryman, a crippled old gangster, and the world's most cheerful serial killer.

A small, lone Kappa miraculously survives over 200 years into modern day Japan, when he is found by young Koichi. Coo, who is secretly adopted by Koichi's family, searches with his new human friend for unpopulated places in hopes of finding any remaining of his kind.