Okay I have only read volume two (yes I am serious I haven't read volume one. Just volume two.), so take this with a grain of salt... Oh my god its the best manga I have read. Its simple, an easy read, just small stories with the sillies... You don't even have to start at the beginning to enjoy it!! What more could you want from a manga!? Okay, well... Perhaps its not the absolute best. There's a few problems: Its a little too simple. It doesn't have much plot, you can really just read whichever chapter and you'll (probably) understand it, and while I personally like thisI understand that plenty of readers won't.
Its not serious. At all. Once again, I like this quality of it, but it's not something all readers will enjoy.
And finally, the characters tend to feel one dimensional. They don't feel like there's much to them, and while that makes it a simple and calming read... That doesn't make it the best by a mile.

Overall, I adore this manga and believe more people should read it!! Criminally underrated!!