That YouTuber clearly doesn’t understand the essence of proper foreshadowing in storytelling. The only potential relationship that was somewhat foreshadowed is Ikura and Iori, but as I’ve already explained, that’s still not enough to conclude that they’ll end up together. Hakuri and Iori haven’t even met, so we don’t know what Hokazono has planned for them. As things stand, Chihiro, Hakuri, and Iori haven’t shown any romantic interest in anyone.

Hiyuki is another interesting case because Hokazono established early on that she isn’t particularly fond of Chihiro. They’re also both 18, so there’s room for him to develop their dynamic further. However, that still isn’t enough to claim they’ll end up together.

The point is that romance wasn’t foreshadowed in either Season 1 or Season 2, and Season 3 is currently adapting a flashback arc. So why would Hokazono randomly introduce a romantic subplot in Season 4 after establishing no romantic groundwork across 136 chapters? It would feel forced and risk throwing viewers off because the story never established romance as a possibility for these characters in the first place.