If you're looking for manga similar to Manga Doushite Monogatari, you might like these titles.
Weiss has one dream and that is to see the sky. The city that he and everyone else lives in has a large and what seems to be a never ending ceiling. With the help of his friend Nero, Weiss plans to one day break through to the top and see the sky that no one has ever seen. On one of their missions, Weiss and Nero meet a mysterious girl in black named Nowall who tells them that there is no sky, but before she can completely explain, she gets abducted by the Black Police, a peace keeping robot squad. Now Weiss and Nero have to rescue Nowall and learn the truth about the sky. What they don’t know is that the truth is way over their heads.
In the name of a good and healthy lifestyle, the Good For You Party has banned sweets, pastries and chocolate in favor of nutritious substitutes such as fruits and vegetables. Smudger has to watch his father's pastry shop fail under this new government rule, but when Smudger and his friend Huntly discover a secret cocoa shop in an abandoned mine, they realize that there might just be hope for sweet tooths everywhere!
When Queen Clarion's crown goes missing on the night of Pixie Hollow's biggest bash, all fingers point to one thief - the rude & standoffish fairy Vidia! To keep from being banished from Pixie Hollow forever, Vidia goes on an outrageous hunt for the crown that takes her from one end of Never Land to the other. Can she find the crown in time to save Vidia's reputation?