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Wa! and Manabiya are set in the same universe (at the same school), and there is a considerable overlap in characters -- you should really consider them to be part of the same story.
Manabiya and Wa! are actually talking about the same world, in fact they are talking about the same school. They are considerably similar and the most obvious fact is that they are both done by Kojima Akira
It's the first day of high school, and plenty of school clubs are doing their best to recruit new members, but for ditzy Yui, none of them seem to fit the bill. However, when she accidentally signs up to join the light music club, Yui begins a hilarious adventure to become a world class guitarist! There's just one problem: she's never played the guitar before in her life! Joined by bassist Mio, drummer Ritsu and keyboardist Tsugumi, Yui and the gang juggle their studies with buying instruments, learning how to read music and even performing in the school festival, all in the hopes of someday becoming a successful band!
The after-school club is a frequent theme in manga. In both the cases of K-On! and Manabiya, the club forms the setting for humorous, oddball activities that often have very little to do with the club's stated purpose.
At the old-fashioned Japanese boarding house Narutakisou, Shiratori lives with a diverse yet strangely-similar group of tenants. Under the tender care of landlady Aoba Kozue, Narutakisou provides a home to people whose personal lives are all painful in one way or another; yet together, somehow, they make up a true family. Not only does Shiratori find a home at Narutakisou, but he also finds himself in love with a girl who is far more than the sum of her parts.
It almost goes without saying that Kojima Akira's manga have a lot of storytelling similarities. Although Manabiya is considerably more lighthearted than Mahoraba, the two share a warm, empathetic sense of humour.