The senior is... A ghost?
The instinct of fear made her want to retreat and escape from this unreal existence. But at the same time, fear was overridden by another, stronger emotion—loneliness.
This senior who could hear her swearing in French in a low voice, who could see her crying in embarrassment, and who would even say to her, "It's more pathetic when you cry" was the first and only person she met on this cold campus who seemed to be without any malice and who was willing to interact with her.
Even if she's just a... Ghost.
Japanese light type?
Motto: Don't give up hope.