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A Yu-Gi-Oh style anime except the participants themselves become the cards. And what counts as "participant" is nebulous at best. So the MC will be a hyper serious player but as he's placing cards his friends are transformed into the roles and have to carry out the battles. Often to their consternation since there are a lot of skimpy outfits and clothing damage. And since the power of the cards draw from whoever is in the vicinity sometimes random people, like a girl working a hot dog stand nearby, gets pulled in and transformed into a sorceress and forced to fight a dragon while floating on a magical playfield because MC got into a card battle across the street. The MC himself will have the same hyper seriousness about winning though, not even recognizing that its having this collateral damage.