 If you liked
Toaru Majutsu no Index
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 ...then you might like
Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai
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Male MC coincidentally meets a variety of attractive girls and solves their problems for them, to the point that it is lampshaded in-universe. Yeah, they're both typical light novel stuff, and they're similar enough in theme to bring the other to mind for me. Bunny Girl Senpai features supernatural oddities, Certain Magical Index has superpowered battles.