If you want to read an even cuter manga about a guy working as a teacher in a kindergarten you could give Himawari Youchien Monogatari Aiko Desho! a try. Note that, it's not as much comedy driven as Hanamaru Youchien and the kids there act more like actual kids (unlike what you can find in Hanamaru Youchien).
Satoshi Yabe is the newest employee at Kamohashi Elementary School. Wide-eyed and enthusiastic, he’s thrilled to finally be fulfilling his dream of being a teacher – but little did Satoshi know that he’d be assigned to class 6-3, a group that houses none other than the violent and perverted Marui triplets! Between the girls trying to hook him up with the busty school nurse, dealing with the unfortunate consequences of a hamster named 'Titties' and other misadventures, Satoshi’s dream of an uneventful school life has come to an end!
If you are looking for cute fun series Mitsudomoe and Hanamaru Youchien are great for each other. Each involving little kids each with their own unique personalities and sense of humor. The male teachers are drawn into many humorous misunderstandings along the way, solely because of the kids around them.
With a slight draw of romantic style Hanamaru Youchien and Working!! Have a similar characteristic style. The two series focus on the lives of characters in the work environment and the troubles that go into their everyday lives. Needless to say if you see either of these series, the two main characters could be twins.