The story follows an ordinary old man who one day suddenly is reincarnated as a cute cat, and the president of the company he works for picks him up.

Promotional animated videos of Osaka's entertainment and shopping district, Nipponbashi (or colloquially known as Nippombashi) narrated by Nipponbashi's mascot Neon and her sister Hikari-chan. Nipponbashi is the equal of Tokyo's Akihabara.

After the TV-series of Kimagure Orange Road, Kyosuke and Madoka have finally arrived at the point where they are close to graduation and have to decide where they want to go to college. Naturally, they want to go together, so beside all the studying they also have to look for a proper college where they can enter both. Hikaru, still a year from graduating, wants to support Kyosuke as well and does that in her own way. But while she does that, Madoka feels jealous and tells her feelings to Kyosuke. And then Kyosuke has to take action to finally decide on the girl he loves... thus concluding the story of the Kimagure Orange Road.

Fourth season of the Ketsuekigata-kun! series.