Am I The Only Normal One!? When I Open My Eyes In The Morning, The World Had Thrown Out All Sexual Values.

まともなのは僕ひとり！？朝、目を覚ますと、性の価値観がぶっ飛んだ世界だった件。

I live in a family of five, an ordinary family like any other, maybe even stricter. But one morning, I woke up to find my entire family naked and starting to have sex right in front of me. While I could only panic, my mother, older sister, and younger sister kept having sex with my father.