The "bottle gate" refers to the recent incident where a boarding school girl engaged in masturbation using a beer bottle and had sexual intercourse, while also recording it in a video.
What is the cause? There are many versions circulating online. Version one: It's said that the girl invited a man from outside the school to her dormitory to drink beer together. Afterwards, under the man's instigation, the girl used the remaining beer bottle for masturbation. Vaguely, the sound of the male instructing her to use various movements to complete the process of filming the beer bottle self-masturbation can be heard, after which she had sexual intercourse with him.