Okay I'll spoil the ending. If you want any suspense then don't click. Kazuki tells Enta their relationship is over forever (??) and punches him in the face, knocking him down. Enta was going to punch back, but he just couldn't bring himself to. Reo and Mabu show up and Reo shoots at Kazuki, but Enta pushes him out of the way. Cut to both laying on top of each other. Kazuki opens his eyes, but Enta is shot though the chest. Just like Reo did, Kazuki asks why he saved him. As he holds dying Enta in his arms, Enta tells him not to lie to him that he knows Kazuki hates him. Reo laughs and taunts them, but Mabu tells him to stop and they leave. Mabu tells Kazuki that there's still a way.
End credit scene is Toi getting a call from Kazuki as he's on the boat to leave with his brother. It's unknown if he answers it, but probably not.