"Ryuu's What If" real name Fairy Branch History in danmachi does not have the part where LF will turn off if Bell falls in love with Ryuu :v but only ends with the part where Ryuu accepts to train Bell and returns to the tavern. The end :v and What if that LF turned off was just created by Chinese fans :)))
P/s: Turns out I was being led by chingchong for a long time
link of real "Ryu What if": https://www.reddit.com/r/DanMachi/comments/1276eih/fairy_branch_history_part_1_ryu_what_if_story/