I've been starting to look into the Index universe a bit, and the Mikoto sidestory is BY FAR the most enjoyable part of it
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I think s_b said it perfectly - Mikoto is the right kind of tsundere. She's no Mary Sue, and she's got alot of flaws, but she's fun to watch. And seeing her go all-tilt over Touma is somehow too amusing to put in words. Add in some yuri vibes for color, good supporting characters and funny art, and you have lightweight, but thoroughly enjoyable entertainment.
Sign me on.