The first episode describes Samatarou and Tenko's daily life, and how they and Kumiko met.
Samatarou decides to win Kumiko's heart by his own effort, and asks for Tenko's assistance.
Samatarou gets another chance to get along with Kumiko, but faces more trouble when Meme creates a device to control her emotions.
Tired of their interference, Samatarou convinces his family to transform him into a human, but he was unaware of the consequences of this request.
Shinichi is in awe as he believes he found the girl of his dreams, but Samatarou has a feeling that he knows her from somewhere. Meanwhile, Tenko is behaving strangely.
A mysterious baby appears before Tenko and Samatarou, and the duo decide to take care of her. Meanwhile, Shinichi is having trouble with his crush.
Ai keeps growing faster and faster, and unwillingly gives lots of trouble to Samatarou and Tenko.
After finally solving the mystery involving Ai and the wheelchaired girl, things start to heat up between Samatarou and Tenko. Osamu sends Samatarou back in time since he reveals him as God to a human.
Tenko receives an order to return to heaven as her duties with Samatarou are completed, but she refuses to do so. Just when Samatarou and Tenko are trying to sort out their feelings for each other, Kumiko returns.
Suguru, an Archangel, descends to Earth and accepts Tenko's request to wait three days before she returns to heaven with him. Meanwhile, Kumiko introduces Samatarou to her mother.
Tenko decides to investigate about Kumiko's life and discovers the truth about her.
Samatarou finally realizes his feelings for Tenko and breaks up with Kumiko. Kumiko however, tells him all the truth just before the real enemy reveals herself.
One by one the members of the Kamiyama family fall before Fumiko's power. Samatarou must find a way to fight her, being careful to not surrender himself to wrath and become a demon himself. He then defeats Fumiko by killing the demon inside him. Tenko and Kumiko save him and Kumiko turns into an angel. At the end Tenko and Samatarou kiss and they all take a photo together.
