Anyone know the name of this hentai?

The hentai that I am looking for is one that I saw many years ago (10 or more) was an uncensored hentai that started with a girl who was going to rave a boy (or the other way around) the girl I BELIEVE had brown hair and maybe a red suit and just when they were going to do it they were attacked by another girl outside the house, in the end the girl explodes and only her head remains but it turns out that the girl was a robot and does not die for that, then the girl receives a new body of a small girl , the new body of the girl had flushed cheeks (I think it is a good fact) then in another scene the protagonist has sex with the robot girl in public baths and when she runs inside she faints or something

I've been looking for this hentai for a long time to revive my childhood and I can't find it anywhere :(