Have a younger sister name Mihari Oyama and live with her. At first was a boy but became a girl by her experiment and try to keep it as a secret so Mahiro don't mention about it much. Secondary student. Want to make friends. Not a weird person. Like video games. A bit shy to others but very friendly. She know Kaede (Mihari's friend). Crybaby

Cute but a bit shy to strangers

Ralsei is the princess of dark world in a game called Deltarune who will accommpany in your journeys to seal the fountains to balance the world. She's a nice and kind person who would bring peace to everyone and doesn't prefer fighting. She's a bit shy. She can use magic