About this ebook
フェンシングの合宿先の管理人のおばあさんに扮して、潜入した勝平はそこで密かに特訓をつみ、部内の序列を決める恒例の「階級決定戦」に挑むことに。驚くべき秘技を繰り出し、勝ち進んだ勝平の前に怪しいマスク姿の秘密結社「ＫＫＫ団」と名乗る集団が出現。いったい勝平はどうなるのか！？
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