Youseiken



The refers to a group of five sacred swords that appear in the Yo-kai Watch Shadowside series.

Overview
The Youseiken hold incredible power, and each have mighty Yo-kai residing within them. These Yo-kai are referred to as.

Those who use a Youseiken may be possessed and transformed into its Kenbumajin.

The Youseiken have the ability to change their shapes, like shrinking down to small, knife-like sizes.

History
Due to their incredible power, most of the Youseiken have been sealed away since ancient times, only to be unsealed in times where their power might be needed to overcome great threats.

Yo-kai Watch Busters 2
The Fudou Raimeiken is an item obtainable via QR Code in the game, which can only be equipped to Fudou Myouou.

Anime
In the Shadowside series, Haruya Sakami's goal is to collect all five of the Youseiken, which is supposed to awaken the full power of the "Princess" he is looking for.

In Real Life
After its debut in the anime, real-life replicas of the Fudou Raimeiken started being released in Japan, with the remaining Youseiken starting to follow.

Trivia

 * If Douketsu is the Ashura Gouenmaru's Kenbumajin, it would be the only pair so far without matching names.