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On the first day of the new semester, high schooler Kuroki finds himself seated next to Mai Chihara, a girl rumored to be a "landmine"—someone with a dangerous, unpredictable vibe. Despite the warnings, Kuroki can't help but notice that Mai's aloof demeanor hides a surprisingly natural and quirky personality. As the two navigate school life together, from awkward conversations to unexpected adventures, Kuroki begins to question if Mai is really the "landmine" everyone claims her to be.