Another masterpiece: "His Women's University"
Despite the title it's PG so totally OK.
This masterpiece starts a a RomCom (Romantic Comedy) and does excursions into a mystery detective story, a fighting action story, all while retaining a brilliant comedy, that had me gasping for air while laughting out so loud that my neighbours might think I've lost a marble.
Why is it a masterpiece? Well, because before a slapstick gag, there are a few panels, and then there's the clue. Well, one up that with a panel after that that ups the ante and has you laughing so hard you need to take a little break.
It does everything right: Interesting story, not too many characters so you don't lose the "who-is-who" thread. All well defined characters, all with backstories, quirks and growth. The Manga breaks the forth wall in unexpected ways, like a cow that talks to you, just to name one.
Then there is this learning you can do while carefully reading. I gained much respect for social sciences; being a math/engineering oriented person I gained new respect for the incredible amount of reading you need to sift through. In a sense, math is simple, or more concise and precise. The parents of the protagonist cosplay, for extra point try to recognize each cosplay.
Oh, and most importantly: Women are not portrayed as idiots. Instead, they are more observant to their surrounding, cunning, strong and resourceful all while retaining their femininity. Sure, some are made oblivious for comedic reasons, but it's not all the time. I love that equal standing of both sexes.
And even with all that heavy thematics, it's ultra light and fun to read.