At least we know what the chapter is about.(5 year timeskip period and what happened before they meet again.)
IMHO and guessing, that doujin was just the sex scenes that occurs before their chance reunion. The FMC had been sleeping around with various men without any committed relationships and her lastest partner was a blond man (that we saw in the Reddit's three pages) who reminded her of the MC. After that, she then runs into the MC for real in chapter 49 !
There is absolutely no character development whatsoever. The FMC remains mentally ill but simply cannot forget the MC while the MC was unable to move on either. He has remained single all this time unlike the FMC who has been sleeping around indiscriminately.
So, it’s understandable why the editor didn’t submit it to be uploaded online to be included in the collected volume because it's useless, no content to speak of. However, the author wanted to publish it so she ended up publishing it herself as a doujin.
FYI, Gemini's answer :
Chapter 48.5 is a self-published, independent epilogue doujinshi by the original author, Kei Miike, for the series
Soredemo Ashita mo Kareshi ga Ii. It specifically bridges the narrative gap during the
three-year time skip that occurs at the very end of the main series.
Plot Breakdown
- The Context: After their formal breakup following the family meeting, Kouhei and Mako completely separate. The main story jumps 3 years later to show Kouhei drinking alone, confirming he never dated anyone else, before running into Mako by chance at a vending machine.
- Mako's Timeline: Chapter 48.5 focuses entirely on what Mako was doing during those 3 years.
- The Content: Still unable to resolve her severe physical intimacy issues within a normal relationship, she avoids getting a new boyfriend. Instead, she hooks up with random men to cope with her physical frustration. This includes a sequence with a blonde partner who visually reminds her of Kouhei, underscoring her lingering attachment to him right before their final chance reunion.
