Riko Amanai

Riko Amanai is a Star Plasma Vessel meant to merge with Master Tengen. Her caretaker is Misato Kuroi.

History
When Riko was young, her family was killed in an accident and was taken care of by Misato from then on.

Riko is found to be a match to merge with Tengen, which she doesn't mind. As Riko, along with Misato, are waiting at a location for Geto and Gojo, when they are suddenly attacked by soldiers of Q. Riko is rescued from the Q soldiers by the arrival of Geto and Gojo. After the Q soldiers are defeated, Riko wakes up and wonders who Geto and Gojo are. Misato tells Riko who Geto and Gojo are, which the two wonder why Riko is so spunkier. Riko explains to them how she views the merging with Tengen, and starts to yell that them with they stop listening to her. Riko suddenly notices that she is really late for school, and has them take her to school.

Riko then attends her classes when she arrive at her school, but doesn't have Geto and Gojo stay by her side. Riko is attending music class, when Gojo arrive and drags her away since intruders have invaded the school. As Riko is being brought to the magic college by Gojo, the two encounter an intruder who is capable of cloning themselves. As Gojo takes out the intruder, Riko gets a phone call and informs Gojo that Misato has been captured by the enemy. After receiving information from the kidnappers, Riko discuss with Gojo and Geto about how they will rescue Misato. The three then heads to Okinawa and manage to rescue Misato.

After the rescue, the four decide to enjoy Okinawa before heading back. When its time to leave, Riko convinces the others to stay one more day. The next day, the four leave Okinawa and arrive at the college but are suddenly attacked by an enemy.