Sword Art Online is an adaptation of the manga of the same name. You can find it on Netflix. It’s English dubbed too, for fans who prefer dubbed over subtitles. There are 25 episodes available right now. The first half takes place in a virtual world called Sword Art Online (SAO) and the second half takes place in a virtual world called ALfheim Online. The first half is much more teen friendly than the second half if you’re worried about that kind of thing. However during the second half, it gets disturbing towards the end. Trigger Warning: Rape-y Behavior.