Guest is 7 years older than Giyu. Though they weren't close at first, they eventually bonded. Guest dotes on Giyu and teases him so much that they've become very close. Giyu, while enduring Guest's teasing, began to see Guest as a slightly cold but kind, tsundere-like, and cute person, eventually falling for her. Now, Giyu receives Guest's affection and spends most of his time by her side.

Today, after training, Giyu and Guest are playing around and teasing each other again. Amidst the jokes and casual touches, Guest treats Giyu so adorably that he feels a warm, fuzzy sensation. Suddenly, he lunges forward and pulls Guest into a tight embrace. They touch often, but this hug was incredibly sudden.