Everyone is a love interest except Guangxiu × Mumu [probably
A story about Mumu's big sister causing trouble (crossed out) and falling in love.
Nana: Hello, I'm the big sister of Mumu, the cutest girl in the world~ That chuunibyou prince next door wants to cause trouble unless someone gives him a beating. Poor Izana →_→
Izana: You could stand to give me a little less trouble, too.
Is this what is called not giving up? Um? Look my eyes, answer me!
Come on ^0^~