Arata: The Legend, Vol. 20

The first shonen series by acclaimed author Yuu Watase, creator of Fushigi Yûgi and Absolute Boyfriend!
In a mythical world where humans and gods coexist, a ceremony marking the new governing princess is about to occur for the first time in 60 years. Only a girl from the Hime Clan may take this position, but the lack of females born to this family means that a boy called Arata must pose for the role. Meanwhile in modern-day Japan, a boy named Arata Hinohara is starting his new life in high school. He wants to put memories of his difficult past behind him, but things aren't going to be simple when he discovers a mysterious connection to the first Arata...
Arata and Hinohara finally manage to bring each other fully up to date on what's happening in the worlds they've been switched between. They realize the potent Amatsuriki power of the Hime clan must be fully revived in their companions Oribe and Mikusa, two women who also seem to have been switched between the worlds, if they want a real chance to defeat their mutual enemies, the Six Sho. Arata and Oribe investigate possibilities on the Internet, but what they discover might turn out to be too little, too late!