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Toaru Majutsu no Index Gaiden: Toaru Kagaku no Railgun
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Although not entirely of the same premise, both manga series involves schools that trains their students in various abilities that are measured in terms of strengths/levels.
Both the main characters from in their respective series have similar personalities.
Both series has action, drama, and comedy involved.
There are conflicts involved throughout both manga series that deals with the powers that the students use and adversaries that abuses them for their own reasons.