This art comes from the official twitter account. Check out the Crunchyroll article for additional information. Synopsis for the source manga from AniList:
The master spy codenamed <Twilight> has spent his days on undercover missions, all for the dream of a better world. But one day, he receives a particularly difficult new order from command. For his mission, he must form a temporary family and start a new life?! A Spy/Action/Comedy about a one-of-a-kind family!
Yes. I do. I assumed it was always going to be a wholesome family sitcom. If the spy plot advances, the show is over.