He may not have noticed that voice, but Tsubomi certainly did.

She looked up and turned her head towards the direction the voice came from.

Erika! She was supposed to meet them at the lobby! To make matters worse, she could see Itsuki and Yuri there, as well as Shirogane's friends (?). One of them, the one with the glasses was making placating gestures at Erika while saying something Tsubomi couldn't quite catch from this far away.

As the blush spread to the tips of her ears, she pushed against Shirogane.

"Sh-Shirogane-san!"