Several hundred years ago, humans were nearly exterminated by titans. Titans are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a city protected by extremely high walls, even taller than the biggest of titans.<br><br>
Flash forward to the present and the city has not seen a titan in over 100 years. Teenage boy Eren and his foster sister Mikasa witness something horrific as the city walls are destroyed by a colossal titan that appears out of thin air. As the smaller titans flood the city, the two kids watch in horror as their mother is eaten alive. Eren vows that he will murder every single titan and take revenge for all of mankind.<br><br>
(Source: MangaHelpers) 

More like Biyaku zenbu nomanai to de rarenai heya / A room that you can't get out without taking all the aphrodisiacs

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Miowaru made Derarenai Joutai Henka Doujin Eroge no Kaisou Heya | That Room of Reminiscence In Eroge Where You Can't Get Out Until You See Everything To The End