 If you liked
Aku no Hana
|
 ...then you might like
Magi no Okurimono
|
I won't claim that Magi no Okurimono is as dark or as avant-garde as Aku no Hana, because it isn't. But both mangaka use their art extremely well to excellent effect. Both also deal with romance and growing up, but whereas Aku no Hana is more psychological, Magi no Okurimono is more emotional. If you liked the non-psychological or non-avant-garde parts of Aku no Hana, Magi no Okurimono would be a good read.