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Rintaro Okabe is a self-proclaimed "mad scientist" who believes that an international scientific organization named SERN is conspiring to reshape the world according to its own interests. He and his friend Itaru Hashida inadvertently create a gadget able to send messages to the past.

Long ago, all humans lived in the ocean. But some who longed for the land abandoned the ocean, casting off the special raiments granted to them by the sea god to adapt them to life under the sea.

Taken from AniDB - Once, there was a group of close childhood friends. However, by the time they entered high school, they had grown apart from each other.

Three siblings, twins Kanba and Shouma, and the in-and-out-of-the-hospital Himari who's in poor health, live together at the Takakura home. One day, when the siblings are out on a trip to the aquarium, Himari collapses.

In 2015 huge, tremendously powerful alien war machines return to Tokyo. The only hope for Mankind's survival lies in the Evangelion, a humanoid fighting machine developed by NERV, a special United Nations agency.

In the future, all facets of society are tied into Oz, a virtual world inhabited by millions of users. Kenji, one of Oz’s moderators, was set to begin another typical summer when the lovely Natsuki asked him to accompany her to her hometown as a job.

Tohno Takaki and Shinohara Akari are two classmates in an elementary school. During their time together they have become close friends.

In an alternate timeline, Japan was divided after losing World War II: Hokkaido was annexed by "Union" while Honshu and other southern islands were under US sovereignty. A gigantic yet mysterious tower was constructed at Hokkaido and could be seen clearly from Aomori (the northernmost prefecture of Honshu) across Tsugaru Strait.

About one thousand years into the future, civilization has been retrograded and humans are living dispersed within small communities. People in this era have a psychic power called "Juryoku" which materializes things they imagine.