She wakes up to an argument between Eli and Hino. But from the sounds of it, it was one-sided. It was mainly Hino arguing with Eli. Sumire waited for a few minutes before she heard the sound of the door slamming. Sumire sighed deeply as she placed her hand on her head.
Nothing good happens when Hino ends up in a bad mood. But with her current state, there is nothing she can do. Moreover, her words may have the opposite effect.
Also, maybe she underestimated him too much. This entire time he showed her such kindness, and she enjoyed his company as a friend. If she thought about it carefully, he would not go that far for a normal friend. He cares a bit too much for her. But as long as he never openly said it, Sumire thought she could carry on as normal. But just now, that anger for her sake and even going this far to protect her. When she sees Yuhi again, she has to talk to him about this.