暗号学園メタバース編、突入!! 地下深くに眠る500億モルグを目指し、小芝井躾（こしばいしつけ）と共に最下層を目指すいろは達。しかし、地下44階では意外な敵が待ち受けていて――!? 暗号バトルか卓上バトルか！ 負ければ即ログアウトの軍法麻雀（マーシャルマージャン）、開局!!
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