Also they are actually half brothers they have different mothers http://www.mangago.me/re...

Yep, that doesn't change the fact they are brothers.
It is incest all the way.

I think they are stepbrothers. I think... see this part:
http://www.mangago.me/read-manga/ienai_itami_o_daite_iru/bt/259471/Ch0/17/

He said...his mother remarried...so I think he get old brother and father.

I´m confused （/TДT)/

Wth this confusing shit who even knows

Even though they have different moms they are still blood related because they both have the same dad..

Maybe they aren´t blood related...

Lmao who the hell knows it's an nice story either way

Your right,in sender's note she said that she wanted them to be real bro. Exc...