/vr/ - Retro Games

>>9028889
>to promote the game
That's the reason many anime exist in the first place. Even many popular ones are there just to promote the sales of the manga, which is where the real money is.
Also you can find the most absurd OVAs in the late 80s-early 90s. There's a Power Dolls OVA, and even SHMUPs got some.