So, I think I broke Takumi's quest line
The game let me confront Takumi and his Harem before finishing Reika-Keigo questline (right after Takumi went cray-cray), so I thought "welp, why not, what could go wrong"... Big mistake.
Turns out failing to subdue Takumi, makes his boss fight really interesting (I ended up fighting against up to 3 Takumis since I wanted to explore all 'none kill' options of Takumi before tying him up, every time Yona died or became one of his sluts, he dupped). Last time, tied him up, gave food and water, got the walkie-talkie. No biggie.
Then stuff got weird. After that, I continued Reika-Keigo... And just before confronting Keigo, a pink quest marker appeared on Takumi's Harem. I feared that the game reset the Takumi's quest, so I did that again to be sure. Weirdly enough, when I chose tie him up, he didn't get tied, instead he talked something (I skipped, since I 'already saw' thatscene), and left... And 'joined' as my friend. Wut
"Ok, don't give that too much thought" I said to myself, finished keigo-reika... And nothing of Takumi's green quest marker.
I wonder if the game just YEETed at me, or I did break the quest... And John's walkthrough already says that it is possible to recruit Sally; So I just wanted to leave here the 'bug' so you guys don't try to greed out like me, the game might dislike it.