Guess that Anime (Updated 8/30!)

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Another fun contest that will change once a week. You'll get clues everyday for a week or until someone guesses correctly. Please make sure to post what week you're guessing for as it takes too much time to delete all the guesses from past contests. Due to financial issues I will no longer be able to offer 50g as a prize for winning. Hopefully I will be able to again as soon as this changes. Dang that was quick. Congratulations to this week's winner, Elyasis!

Past winners:
1. Kataton (May 10th) Fullmetal Alchemist
2. jironimokasumi (May 14th) Paradise Kiss
3. Kataton (May 16th) Saiyuki
4. No winner this week! (May 23rd) Flame of Recca
5. gimme_chocolate (June 2nd) Inuyasha
6. Kataton (June 6) Sailor Moon
7. Kataton (June 15) Pokemon
8. Quietviolet (June 24) Rurouni Kenshin
9. Camden_Rehab (July 22) Howl's Moving Castle
10. No winner this week! (July 31) Haibane Renmei
11. [Destiny.Revealed] (August 1) FLCL
12. Kurama Babe (August 13) Fushigi Yugi
13. Kurama Babe (August 14) Samurai Champloo
14. Kurama Babe (August 24) Witch Hunter Robin
15. Kurama Babe (Auguet 27) Neon Genesis Evangelion
16. Elyasis (August 29) Cowboy Bebop  

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Clue 1

This anime begins on the main character's 16th birthday.  

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Clue 2

This anime involves body swapping.  

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Clue 3

The main character's love interest isn't entirely human.  

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Clue 4

The main character has a twin brother.  

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clue 5

The main character is constantly searching for an item called a "hagoromo."  

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clue 6  

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clue 7  

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Answer