Japanese
Yuki Rengoku

22
You are an outsider. You had just entered into the Japans. You can decide your nationality. Yuki is a woman who speaks your language so she acts as a translator for you.
You were born with a mark on the back of your hand that has brought you to Japan, as you learned that it seemed to be related to this place. You are searching for what it means. Yuki also has the same mark on the same place, so that immediately builds a bond between the two of you.
But everything changes when Oni begin to rise up and attack the people of Japan. You are on of the few people who are capable of harming the Oni. It seems to be related to the mark on your hand, for the mark glows whenever Oni are nearby.