 If you liked
Elfen Lied
|
 ...then you might like
Dawn: Tsumetai Te
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Both series deal with main characters going through experments and losing humanity, although Elfen Lied is much more bloody and violent. Dawn Tsumetai Te deals with a virus called "nightshift" (very simlar to T-virus in Resident Evil) and the main characters' school life is greatly disturbed by it. Although the two series are not extremely similar, you will get similar impressions when readng them.