In Disgaea 3 - Absence of Justice/Detention, during the story scene of Evil Academy Culture Fair Map 2, when Salvitore, Master Big Star and Mao were looking for the one who was trying to destroy the Culture Fair, they arrived at the Sophomore's "Super Elegant Cafe".
When Master Big Star tried to point out that his Sophomores couldn't be the culprits, Mao got suspicious and said:
Not to mention, all the food as cursed writing, chanting "Moe Moe Kyun♥" to cast spells, and confusing all your customers!
Given Evil Academy, with how the Cafe looked and how Master Big Star was willing to force Mr. Champloo to make bad food to satisfy some customers (which was against Mr. Champloo's ideals as the Home Ec Teacher), it seemed to be an act of delinquency (in Evil Academy, Delinquents did good thing like volunteer work and going to class, while Honor Students did the opposite - skipping class, breaking rules, etc.). Since Mao was an Honor Student, I assume "cursed writing" and "chanting" are normal things we would expect in a cafe (as Mao was suspicious of the Cafe from the beginning before they said "Welcome back students who are coming in for the first time")
I can assume "cursed writing" would be like notes written on the food like you do with cupcakes. However, while I know what Moe is supposed to be, I don't understand what "Moe Moe Kyun♥" is. Does this have anything to do with maid cafes or Japanese culture in general?