misaka mikoto, shirai kuroko, index, last order, uiharu kazari, and 19 more (toaru majutsu no index and 1 more) drawn by kaeru_kenshi

Danbooru

Resized to 80% of original (view original)

EMUltra3

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So could this be considered Touma's harem?

Nope, still missing a few.

wrinty

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Nah, there's some other people in there that belong to Accelerator's harem and other guys.