Save Your Friend! Samurai Heart!

In order to rescue Seiji, Nasty, and Jun, who have been captured by a new enemy, the Shikaisen, Ryo, along with Luna, a local girl whose brother was killed in the incident, heads to the Japanese town where the Shikaisen awaits, along with Shin and Shu... But who is the enemy waiting for them there?! Now, the legend of the armor is reborn!