If you liked
Oniisama e...
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...then you might like
Glass no Kamen (2005)
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Direction wise these two shows look pretty similar, since Glass no Kamen seems to copy a lot of elements Dazaki used in his works, in order to give an older look to this classic title even though it was produced in 2005. Both works are character driven, contain a lot of drama and taboo relationships (which was pretty common for 70s manga).