Tenjou Rio

One of the two candidate successors of the Tenjo family. She has lived in England for a very long time due to circumstances caused by her parents. She masters in fencing, more particularly in the discipline of épée.

She is the cousin of Yuuto and Kikyou.

Rio is a nice girl from the West, impulsive and proud of herself, the exact opposite of her cousin Kikyou. After her first defeat against her because of Yuuto's kiss, she decides to live with him for having a Spartan training life at his side.

Naive, she executes all the orders that Yuuto gives her without thinking and without realizing that he is just kidding.