Nana Maru San Batsu

(Esta sinopse está em inglês. Ajude a comunidade traduzindo!)

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As soon as he entered high school, the first year student Koshiyama Shiki was invited to the mysterious Quiz Study Group led by his senpai. What will Shiki run into when being dragged along by his class mate Mari into the dazzling world of competitive quizzes?!

(Source: Comic Walker)