Ore dake ni Koakuma na Doukyuusei

Gloomy and quiet Hijiri Amemiya is suddenly confessed to by the most popular girl in school, Ema Kohanai. He refuses, thinking that it must simply be a cruel joke, but ever since, he keeps finding himself in increasingly tempting situations with Kohanai-san: Being squished closely together on the train, seeing her panties repeatedly, and even getting locked in together in the gymnasium storage room...?!