Iwasaki, who is consistently despised for having the single worst personality in school, picked up a mysterious gold coin — which turns out to be an invitation for the magic card battle "Zecchou (Climax) Duel"....

Pi is a constant that defines a circle. It is never ending and to Sawaki Yumeto, it is a majestic number that has a direct relationship to his other favorite thing, boobs. One day, he realizes that there is a...