I just got the Arfa-Sys charm

this is the list of what you have to do to ensure you get the true ending

first thing first, DO NOT CLEAR SBC FLUGEL yet after the first rewind

your quest list should look like this after your rewind

- (grind)increase affinity of ALL NPC in friend list (yeah even Rain, Premiere, Strea.....) except for LLENN, M, ♥♥♥♥, and Pito (I'm absolutely sure these 4 do not need any affinity increased, I also have screenshot)

-- [a note to this too, in Kirito Mode there are also green bubbles, clear them up too, everyone's in the Lobby btw] (so this might require another speedrun)

- clear all NPC cutscenes (do not leave any green speech bubbles in any map, even the ones in the Lobby)

- do not clear SBC Flugel (I repeat this one more time)

* one thing I'm not sure is that if this can be done in normal mode as I've only cleared the game in Extreme after my first run;
* another note Kirito and the protag have the same affinity levels for the NPCs so you don't have to go Kirito mode just to grind affinity

then, go to your Home and Arfa-Sys will initiate a dialogue (of course, before clearing SBC Flugel boss)

one last check for any green circular squares on all Glocken maps

believe me,
.....I have tried 4x already, check my playtime (will edit if I somehow forgot something, someday)