Unidentified anime from early to mid 2000s?

[HystericalStrawberry]

I'm going off of just one episode that I watched when I was 7 or 8, but please bare with me here-- From what I remember there were these two highschool kids, a boy and a girl, hanging out at the girl's house. For one reason or another the girl starts turning into a monster of sorts and attacks the boy. The boy's back ripped open and his blood turned into a scythe-like weapon. They end up fighting and the girl is defeated and turns back into a human. They hang out the next day and the girl apologizes for attacking him and hands him a soda. He thanks her and drinks it and the episode ends. I'm sorry I don't remember much, but I was hoping somebody here might know the show I'm talking about? It aired on adult swim sometime in either 2007 or 2008. If anybody knows what this show might be, please hit me up.

[efaardvark]

Sorry, doesn't ring a bell.  The only show I remember offhand where someone's blood turns into a weapon was Kyoukai no Kanata.  In that one the girl uses her own blood to make weapons though, not a guy.  In the first couple episodes the girl, Kuriyama Mirai, is obsessed with killing an immortal boy, Akihito Kanabara, but eventually she gives up and they become friends.

[HystericalStrawberry]

Thanks for the response! I could've mixed it up since it's been so long lol- That might be the show I was thinking of. Again, thanks a lot

[efaardvark]

It was a good anime.  Worth a watch if you haven't seen it.  I liked the OP..
 

 

[Estatia]

Sounds like a weird mix between Soul Eater and Parasite... Any details like eye color hair color was it a graphic transformation? was it gory one? How was the fight? Features on the girls transformation?