Kaiju No.8: Hoshina's Day Off is a special anime that premiered in winter 2025, produced by Production I.G.

About the production: the story comes from a manga, there is 1 episode of about 20 minutes and its current status is "finished".

Its main genres are sci-fi and slice of life, with themes such as Shounen, Tokusatsu and Kaiju.

On AniList, Kaiju No.8: Hoshina's Day Off has an average score of 69%, a good score, and appears on 24,227 users' lists.

A day off... a rare day of peace for the Defense Force. After spending so long training, Reno has forgotten what he's supposed to do with free time. He sees that Hoshina is up to something with his own day off, and decides to go on a mission to tail him with Iharu! But then things go in an unexpected direction… (Source: Crunchyroll)

Official synopsis from AniList.