Is this complete or ongoing

Ongoing lolll. We still have a long way to go

Oop actually, apparently it’ll finish at chapter 104? So it’s nearly done!

I assume the next 4 chapters are the side chapters? Or is it actually done at 100?

No the story finish at chapter 104, you could say 104 is the epilogue but it's just a classic ending (in the format) not 100 chapters of side-stories like in manhwa/webtoon