21st Century Boys

Synopsis

As the conflict between Kenji Endo, his childhood friends, and cult leader "Friend" comes to an end, two mysteries remain—Friend's true identity and whether the threat of an "anti-photon bomb" before his death was legitimate. Hoping to find an answer, Kenji, alongside the United Nations, decides to use a virtual reality program created from Friend's childhood memories in this conclusion to a long journey that will span dozens of decades. (Source: MyAnimeList)