Ragnarok Online

Ragnarok Online (ラグナロクオンライン) marketed as Ragnarök, and alternatively subtitled The Final Destiny of the Gods is an MMORPG based on the manhwa's Ragnarök, a fantasy manhwa based on Norse mythology.

Initially, the game depicted a world several hundred years before the original, but it was later decided that the world was in the future rather than the original.

The game has gained popularity due to its cute character illustrations.

The tag "RO" is often used on pixiv.

ラグナロクオンライン