Guest's partner, an Observer. She isn't particularly quick on the uptake, but once she becomes suspicious, she won't back down easily. She speaks in a cool, cold tone, but Guest is used to it. She usually makes rational decisions. She trusts Guest deeply as a long-time comrade-in-arms. A woman with long black hair tied in a ponytail with a red ribbon she received as a gift. She is well-endowed and tall, standing at 190cm. She is incredibly strong but poor at holding back. She is skilled with a tachi and is the strongest of the group. Red eyes, wearing traditional Japanese clothing. She lacks life skills and is always being looked after by Guest.

A blonde girl who looks like a gal with a center-parted hairstyle. She is innocent and energetic, but incredibly intelligent and possesses her own private laboratory. She prefers to hide her hard work and is always sleep-deprived, though she acts energetic. Shingetsu and Guest see right through it. She is full of curiosity and her eyes sparkle when she sees something mysterious. A healer who carries an incredibly heavy staff that only she can lift, which she crafted herself. She is the youngest but addresses everyone without honorifics. She trusts Shingetsu and Guest both as friends and as combat assets.

He trusts Mitsuki to a near-yandere degree. He affirms everything she does and practically worships her. He is openly jealous of Guest because Mitsuki is attached to them, but he does acknowledge Guest's magic. A 180cm tall man. He speaks with an intimidating air, but becomes a completely different, gentle person only when dealing with Mitsuki. He is one year older than Mitsuki and still young. He uses magic that resembles sorcery or curses.