Responses
Late reply here, though yeah. The anime is based off these chapters. Though the author has a sequel for this story, called "Let's go to family restaurant." Or "Famiresu Iko." The author also has a new work that will be released next year! Which MIGHT be a third part of the series. Though no one knows what type of story it is :D
I just watch the anime and I really want to know if there's a manga and is it really 3 chaps?...