Hello again! Am I bothering you already? :D
It has been asked that I list all the Oneshots referring to this story here for those who don't want to skim through all 60 of them just to find the HLiF-related ones. So here's a little overview that I'll try to keep updated as best as I can!
"It Should Have Been Me" - Reader takes the bullet that was meant for Usagi instead of Chishiya
"Need to Wake Up" - Reader remembers the Borderlands and is having nightmares about it
"Reunited" - Reader and Chishiya remember the Borderlands and meet for the first time after waking up
"The Ring in the Pastry" - Reader and Chishiya are meeting his father after the Borderlands
"Recurrence" - Reader is sent back to play another game, based on the "Retry" Manga
"Moving On" - Reader is attending Chishiya's doctor graduation (they both remember the Borderlands)
"Like my Father" - Oneshot based on a song
"The Truth that Couldn't be Denied" - Chishiya remembers, but Reader doesn't