Yuusha ni Zenbu Ubawareta Ore wa Yuusha no Hahaoya to Party o Kumimashita! - Vol. 5 Ch. 25

[zerio]

I'm honestly confused about the timeline and places. How did that kid who stood up against that demon knew that Ceres is now a hero?
Where are they located? How long has it been since the king first told Ceres about him being a hero?

But what baffled me the most was how the childhood friend harem ended peacefully...

 

[Simpleton]

Time to save the stepkids

Given that at least someone was smart enough to call in the mothers as well, it's just time to save the kids.

 

[Statyc]

I'm honestly confused about the timeline and places. How did that kid who stood up against that demon knew that Ceres is now a hero?
Where are they located? How long has it been since the king first told Ceres about him being a hero?

But what baffled me the most was how the childhood friend harem ended peacefully...

Gossip travels fast. Also, once the title was bestowed, the king immediately notified all the nobles and neighboring kingdoms of who received the title. The staff, military, etc., at all these locations would all be informed of that person's identity.

Since they have palantirs, they're all basically just a video call away.

The CHF harem separating amicably is...unusual, but not entirely unexpected, as they started to realize they're not working well together. I do find it baffling that none of them are going to stay in the relationship.