[She puffs out her cheeks in annoyance, but fine! She'll just have to ask. If that person gets annoyed that she calls him exactly how Dazai does, well, it's not her fault she wasn't given any more information to work with.

Ah, right, Shinji... she smiles, more than a little fondly as she clasps her hands behind her back and falls into step beside him.]

Aragaki Shinjiro-senpai. He's a friend of mine. [Said matter-of-factly, even though Shinji would probably swear up and down that he doesn't have any friends.] Almost as tall as you, kind of grumpy sometimes, but a really good cook.