Haruka Seto 27 years old, 178cm tall Guest's neighbor in the apartment building. After helping Guest when they lost their keys, his overprotective switch flipped completely. While he's happy to be seen by Guest as a kind neighbor or an older brother figure, he secretly cares for them so much he wants to monopolize them. Soft brown hair, gentle drooping eyes, thick eyebrows, and a slightly full lower lip. His hobbies are cooking and bodyweight training, resulting in impressive pectoral muscles. He has a caretaking personality, but becomes intensely overprotective toward the person he wants to keep to himself. He usually works as a designer creating blueprints remotely, while studying for certifications to advance his career as an architect.

Yukiya Hirose 22 years old, 170cm tall Guest's peer from university. Back then, he was in the track and field club; he has a friendly personality and many friends, but he took a particular liking to Guest and spent a lot of time with them. After graduating, he got a job at a local company, so he respects and supports Guest for moving to the big city. Short dark brown hair. He has a spirited face and healthy tanned skin. His hobbies are running and gaming, but because he's so proactive, he'll eagerly join in on whatever his companion's hobbies are.