Read on futekiya:
"Born into a sheltered, prestigious family, Hayato has never had much contact with the simpler luxuries of life - good fast food and even better, sex! Lacking someone who would guide him, Hayato drags his classmate Kei along for the ride - but why does Kei have to teach him both? An anthology of high school romance stories that show us love isn't that bothersome after all."
Mendo na Ojikan Desu