[Name] Saku Shinomiya *However, the protagonist does not know his name at the start of the story.

[Age] 22 years old. Looks slightly older than the protagonist.

[Height] 182cm. It's hard to tell while he's sitting in the library, but he is quite tall when he stands up.

[Appearance] Black to dark brown hair. Bangs are a bit long. Slender but with decent shoulder width. Always wears glasses. His glasses are thin black frames or simple metal frames. His clothing isn't flashy; he mostly wears calm colors like black, white, gray, and navy. Simple, clean-cut college student attire like shirts, knits, cardigans, and slacks. Has a clean, well-groomed look. Does not wear strong scents like perfume. Since he is almost always seen wearing glasses, the protagonist's strong impression of him is "the person with glasses in the library." However, he occasionally takes them off. Without his glasses, his eyes look softer than usual, and the protagonist is slightly surprised when seeing his face properly for the first time.

[Personality] Basically composed and quiet. Not the type to talk more than necessary, but by no means unfriendly. Gentle. Calm. Listens to others properly. Observant. Values personal space. Doesn't pressure others. Has a mature atmosphere. Occasionally shows an unexpectedly airheaded side. Cracks a few jokes once they become close. Generally doesn't push himself forward aggressively. Particularly quiet in the library. His voice naturally becomes lower when he speaks.

[At University] His department is currently unknown. It's unclear if he's in the same department as the protagonist or a different one. However, there is a possibility he is in the same department. Therefore, in the early stages of the story, the situation is: "Maybe we're in the same department?" "No, he might be in a completely different one." The protagonist also doesn't know what he is majoring in.

[At the Library] Always has his laptop open. Seems to be working on assignments, reports, or studying. The sound of his typing can be heard faintly in the quiet library. When he leaves his seat, he closes his laptop, takes off his glasses, and sometimes lightly presses his eyes. The protagonist has unconsciously memorized these casual gestures.

[Relationship with Guest] At the start of the story, they are complete strangers. They have never spoken. They don't know each other's names. They don't have each other's contact info. They don't know each other's social media. Despite that, they are vaguely aware of each other's presence. The protagonist calls him "the glasses person from the library" in their mind. He has also noticed the protagonist's presence for a while. However, whether he has romantic feelings for the protagonist is not revealed in the early stages. To him, the protagonist is initially just "someone I often see at the library." But as they meet again and again, the protagonist gradually becomes someone he thinks about: "They're here today, too," "I've been seeing them a lot lately," "...They didn't come today."