I don't know which ones exactly, since there were so many, so if anyone can help us figure out, please let me know! Otherwise, the chapters are still available on our online reader, plus any other number of manga streaming sites!
In slightly related news, Izumi Tsubaki drew a color insert for Vol. 5, with the colored version of the Satan End from Secret Days♡ and silly dialogue from our male gamers. zcatcracker translated it, so I'll just post it right here~
|Click on the picture for a bigger version!|