[Mikezoutei] Waisetsu to Iu Gainen ga Shoushitsu shita Sekai [Full Color] [Rising Sun Translations]

In a world where the concept of indecency has simply vanished, one flustered student is the last holdout of shame while his busty, ponytailed teacher and every classmate, mother, and stranger on the street treat public sex as casually as small talk. She corners him flushed and nude but for a ribbon, insisting they're 'best buds' even as street corners erupt into open-air orgies where women cry out about wombs filled with warm cum and mommy milk flowing free. Haunted by the wish he could go crazy like everyone else, he drifts toward a moonlit visitor whose heavy breasts and shameless hunger might finally drag him under.