Nyanta no Otanjoubi wa Kaji Sawagi! is a oVA anime.

About the production: the story comes from an original script, there is 1 episode of about 12 minutes and its current status is "finished".

The film tells the story of Nyanta, whose birthday party is today. On his way home to prepare for it, he scolds some other kids for irresponsibly playing with fire. When Nyanta gets home, he agrees to look after his mother's cooking while she's away, but a prank set by the same kids from earlier turns into disaster as it causes a fire in the kitchen.

Official synopsis from AniList.