

However, their father saves Yui by bashing Goro over the head with a frying pan, accidentally killing him he then gets rid of the body by serving Goro's flesh to the customers in his restaurant. He goes into an extreme psychosensitive rage and he screams he's going to kill everyone in revenge. Although she hesitates, he gets angry and he traps her, bursting loads of his zits on his face at once so that pus rains down onto her. One day, Goro orders Yui to go out and buy more oil for him to drink when they run out. He is bullied at school because of his skin condition, which makes his already extremely violent temper worse. As he becomes a teenager, he develops extremely severe acne from the grease in the air, puberty, and his habit of drinking oil straight from the can. Yui's older brother, Goro, is a violent and abusive bully.

Yui becomes sensitive to what she calls the "saturation level" of grease in the air, which currently stands at 50%. The shop and restaurant are covered in oil and grease, and the air is constantly heavy with grease due to a lack of ventilation. Yui and her family live above the barbecue restaurant her father owns, in a town at the foot of Mount Fuji.

Chapter 5 of Voices in the Dark and Chapter 9 of Shiver (titled as Greased).
