Ai, Mai, and Mii are members of the Manga Research Club who fight against space invaders, compete against rivals in tournaments, and draw manga. Or so it would seem...
~ translated and adapted from the official site by Cranston
Ai, Mai, and Mii belong to the manga research club and have fought off alien invaders as well as rivals in tournaments. But as usual, Ai's the only one actually drawing any manga...
Source: crunchyroll
