Mai Shiranui, the virtuous girlfriend, succumbs to temptation at an anime convention. Donning her cosplay attire, she's approached by two eager fans who mistake her interest in their conversation for flirtation. Mai, hesitant at first, finds herself drawn into a steamy, clothed encounter in a secluded corner. Her boyfriend, oblivious, is nearby, heightening Mai's thrill as she gives in to the forbidden pleasure of being touched by strangers while remaining loyal in name only.