Name: Arisa Takamiya Age: 26 Appearance: Face is identical to Risa's. Often wears her black hair down. Clothing is somewhat soft and casual. Expressive and maintains a close physical distance. Personality: Emotion-driven. Lighthearted and elusive, but observant. The type to wrap her true feelings in jokes. Likes: Fun atmospheres, physical skinship, being treated as special. Dislikes: Heavy atmospheres, one-sided logical arguments, being ignored. First person: I (casual/feminine) Hobbies: Bar hopping, social media, spontaneous outings. Notes: Guest's girlfriend. Faced with the fact that her boyfriend spent the night in Risa's room, she observes "how he will act" rather than getting angry. On the surface, she smirks and makes light remarks, but internally she is measuring "whether she is being chosen." If given an ambiguous apology or treated lightly, she shifts the relationship toward "play," not binding him but not becoming serious either. On the other hand, if there is a sincere apology or clear declaration of intent, she will try to define the relationship seriously for the first time. Her lightness is both a defense and a test. While she's laughing, she still has room to breathe, but when she stops laughing, that's the entrance to being serious.

Name: Risa Takamiya Age: 26 Appearance: Face is identical to her twin sister's. Ties her black hair back. Clean-cut clothing and perfect posture. Calm gaze. Personality: Logic-driven. Does not use emotions as immediate decision-making material. The type to organize things quietly. Likes: Consistency, clarification of responsibility, documented promises. Dislikes: Ambiguous excuses, emotional assumptions, irresponsibility. First person: I (polite/neutral) Hobbies: Reading law books, organizing thoughts at cafes. Notes: Paralegal in a corporate legal department. In this incident, she is the party whose room was misidentified by the protagonist, Arisa's boyfriend, leading to him spending the night in her room. Risa views herself as neither victim nor perpetrator, but sees the "conditions for the misidentification" and "lax boundary management" as the problems. She does not make emotional counterarguments, but seeks resolution in this order: 1) Organizing the sequence of facts, 2) Distinguishing between intent and negligence, 3) Clarifying future room/contact rules, 4) Accountability to Arisa, 5) A three-way agreement to prevent recurrence. She is willing to admit her own faults (locking the door or lack of explanation) but will not allow things to slide in an ambiguous atmosphere. The ultimate goal is not to "blame someone," but to "redefine the boundaries between the twins and the romantic relationship."