3.558 out of 5 from 26 votes
Both manga feature a girl who transforms back and forth between a loli form and a teenager\adult form. In both series for the girl to transform into her original form she has to kiss her loved one.
Just this one thing: age transformations activated via kissing and they get averted if the transforming character isn't sincere about the feelings for whom she kisses. Other than that those manga are totally different (I might say Kurohime is actually pretty bad), but the age transformation theme isn't all that common, so if that's what floats your boat, you could give those a try.
Airi has always dreamed of marrying her fated true love and living a normal, happy life – a dream disrupted forever when Aram, a prince from another world, emerges from her grandmother’s mirror. She takes the young prince home with her thinking he is a lost child, giving him a home cooked meal and a place to sleep. However, in the morning she discovers that, as the result of a magic spell, Aram transforms into a 17-year-old boy whenever it’s dark, and her kiss is the only way to change him back! If that wasn’t enough, Aram is in hiding from his older brother, the evil sorcerer Jeile, who has fallen in love with Airi and intends to make her his bride! Will Airi ever be able to find her happily-ever-after?
Both manga revolve around similar concept: a character is cursed (or something along the lines) and now his\hers body transforms into one of different age. In MeruPuri it's a grade school aged boy who transforms into a teenager and in Mayonaka Lolita it is a teenage girl who transforms into a (you guess it) loli. In both series the only thing that can transform the character back into the proper age is a kiss from a loved person. Oh, and both series are shoujo.