Quiet Kagamiya's Sweet Affection

Story :  Kagamiya is a lot of things: superb researcher, dedicated worker, and the most charming man in the department. However, he's got one major issue... he's totally not what everyone thinks him to be. He looks stoic and charming, but really he's just a ball of anxiety who can't change his facial expression anymore. He's kept up with what's been expected of him, and is always trying his best at work, but that's left him lonely. That's where his savior comes in: Nonoi. Nonoi's the only person in the department to ever treat Kagamiya as a person as opposed to some almighty charming man. One day, the two of them are drinking on the roof when she suddenly asks him if they could spend the night together...?!