Kamijou Off-spring -- The New Railgun

Taking place twenty years after A Certain Arranged Marriage, Kamijou Touma's oldest child, Misuzu. encounters a certain martial artist from Nerima. A new level of chaos arrives in Academy City AND Nerima as Misuzu finds just what her power is while Ranma comes up with a final solution to his fiancé problems. Ranked M to be safe rather than gomennesai...