Romeo x Juliet, No.6 Recommendations
The plots aren't the same, not even close, but the 'feeling' you get while watching them is the same.
Dark drama, sadness, fighting, blood spillage, deaths and the search for the truth in their harsh world with a little romance mixed in.
In No.6 case, the romance is more of a 'bond' between the main characters (cos they're both male) where Romeo + Juliet is about about their love and passion for each other - based on the original of course.
I also think that the animations are very similar; the way they move, fight and the way the characters are drawn.
So even though the plots are
Both share similarities in terms of execution and ideas, depicting 2 contrasting characters with different backgrounds and the developing relationship between them. They both take a rather surreal turn in their final episodes.