Nanao in the fountain

"Ceremony". Oliver goes for a walk shortly before sunrise on the first day of class, and encounters Nanao stripped to the waist and bathing in a fountain -- apparently completely clueless that she's doing it in full view of the men's dorm or why this is a problem. Oliver hurriedly casts a spell to block the view from the men's dorm, but can't help noticing the topless Nanao is covered in old war wounds. After she realizes she forgot to bring a towel, he offers her the robe from his school uniform, foreshadowing their future relationship.

Example of:
Innocent Fanservice Girl