When Tokidoki Rikugou donned a pair of virtual reality glasses and entered a Bakumatsu-era exhibit at a museum, he had no idea that his life would drastically change. While walking across a bridge in the fabricated reality, Tokidoki ran across a small being and a monster called a nue - and he was promptly attacked. His eye was damaged, but more importantly, Tokidoki discovered that he was now stuck inside the "virtual reality" filled with samurai and spirits. Now, with the help of Kuchiha, a warrior woman possessed by a dog spirit; and Shinonome, a fellow student who has been stuck, just like Tokidoki, for the past two years, Tokidoki must search for the truth behind the nue and try to find a way home.
Both Arata Kangatari and Amatsuki are centered around a high school-age boy who finds himself thrown into a strange world/time period. In that world, each boy discovers he has powers, and must find a way to fit in or get home.
While reading "The Universe of the Four Gods", best friends Miaka and Yui are mysteriously transported into a strange world full of magic and unfamiliar faces. As if their arrival was determined by fate, Miaka is revered as the Priestess of Suzaku, the savior of their warring country, who was destined to arrived in a flash of light, from a land far away. Betrayal, love, and heartache accompany this fantasy-filled tale of friendships torn apart, and hope that never fades.
Both series were not only created by the same person, but they both feature main charcters who get transported into a strange fantasy world, and are subsequently said to be destined to save that world.
The year is 2022, and gamers have lined up on launch day for Sword Art Online, a hotly-anticipated MMORPG that lets players connect to an immersive virtual reality world with special helmets called Nerve Gear. Kirito is one such gamer who's eager to jump back into action, having spent a great deal of time as a beta tester, and quickly becomes friends with newbie warrior Klein. But soon, Sword Art Online's 10,000 players discover that not only are they unable to log out, the only way they can return to their physical bodies is by beating the 100-level tower's final boss - that is, if their HP doesn't drop to zero first, for death in the game means death in the real world. Now, with no one else to turn to, Kirito and the other participants must survive the game as best they can – some forming guilds, others ruthlessly leaving their peers behind, and many tragically falling by the wayside or to the merciless monsters populating the lands...
A person in a strange/fantasy world who fights against the evils in those worlds. Both series also include token female love interests. While Sword arts online takes place in a digital world both series try to play with the watchers emotions with varying succes. The male lead in both series is portrayed as having a lot of potential power and both work toward a greater goal of saving many people from their opressors.