Bakunyū (爆乳, Bakunyū?) is a genre of pornographic media focusing on the depiction of women with large breasts (usually around an H cup). The Japanese word "bakunyū" can be literally translated to "bursting breasts". Bakunyū is considered a fetish, and is also a branch of pornography, identical to the hentai version except for it's setting, with one being a fictional depiction, and the other real. Bakunyū is a sub-genre within the genre of hentai anime.

The main focus of bakunyū is the extremely large (often impossibly so) breasts of the featured female characters, and their interactions between males who come lusting after them. This is usually limited to a single male character (the protagonist). Bakunyū feature a lot of breast related scenes with the protagonist enjoying their female friend's "assets" and developing a strong relationship over time which may result in them engaging in sexual intercourse.

Generally, media of this kind focuses on the interactions of one or more male characters with multiple females. Their content is always of a pornographic nature, and may feature explicit sexual situations such as sexual intercourse and heavy petting, as well as mammary intercourse.

Bakunyū are also not limited to only heterosexual relationships, they may also contain some homosexual relationships/scenes, but only between females (as you would expect since this genre of media focuses heavily on women's breasts and their size).