On my A Certain Magical Index re-watch, first arc finished and it's quite the gem because it's so tonally different to the rest of the arcs. It's a somber and gritty-esque introduction to the series. Touma's confession about his memory loss in retrospect hits hard for me.

Deep Blood is pretty interesting though disappointedly Himegami’s brought on only to do nothing. Truly Kamachi’s biggest oversight.

Sisters arc on the other hand is really something else. Rewatching it really made me appreciate the writing, solid emotional stuff.

By the by, now that I've completed 3 arcs, which is a good way to gauge a series, I think I'll stop the individual arc reviews and just cover favorites or a whole season. Unless people want me to continue to individual reviews.