there's two different animes that's basically the same but from two different point of views of two different characters The first one is a certain magical index the second one is a certain scientific railgun There is another anime a scientific accelerator but when watching some parts you mite want to look away certain magical index as some but not that much and certain magical railgun has only one that I can remember if you're more into action I recommend a certain magical railgun then a certain magical index then certain magical accelerator