Lilia no Yoru no Odekake Nikki

Amagiri Lilia, a student at Shiraoka Academy.
One day, she loses to a classmate in a test-scoring contest and is forced to run errands to the store without underwear as punishment. When she finished running errands and let her guard down, the wind suddenly pulled up her skirt. Fortunately, there were no witnesses, but the incident made her realize her hidden desires.