|Japanese Name:||笹原 幸治郎|
|Romanized Name:||Sasahara Kōjirō|
|English Name:||Koujirou Sasahara|
|First Appearance:||Episode 1|
|Japanese VA:||Yoshihisa Kawahara|
Koujirou wears glasses, and a black outfit with a white collar. He doesn't actually need to wear glasses and only wears his for show, as shown in one episode where Misato Tachibana was guiding him.
Koujirou behaves much like an aristocrat. He is almost always seen calm and collected, and very rarely (if ever) gets visibly angry. He can be rude to others at times, but he can also be kind and gentlemanly, such as when he handed a piece of his collar to Misato Tachibana to wrap around her hand when she accidentally smashed his glasses. When Misato remarked that he should be mad at her for breaking his glasses, he responded that glasses do not feel pain, but cutting your hand hurts.
He always refers to Misato by her full name. He doesn't seem to care that Misato often shoots him with various weapons, and always appears unfazed no matter how many times he is shot. He hasn't been shown to be aware that she has a crush on him either.
It is revealed in Episode 2 that he is the president of the Drama Club.
Mio has a crush on Koujirou. While he very rarely interacts with her, and doesn't seem to think much of her, she gets very nervous around him.
Misato also has a crush on Koujirou but has a very tsundere attitude towards him. It is said that they are childhood friends.