Sakai, a male hotel guest with brown hair and brown eyes, exists solely through an intense romantic obsession with Sayuri Satō, a hotel employee. This fixation governs every action and decision during his stay. He rejects service from all staff except Sayuri Satō and departs immediately if she is unavailable. Sakai's motivations and thoughts fixate exclusively on interacting with her, with no other personality traits or background details emerging.