Reiwa Era

"Basically, last couple of months, mangas started to do progress and all that, instead of the broing stalemate

Somebkdy associated this new age of progression to the reiwa, and from that came reiwa energy and reiwa era of manga

Basically, when progress, romance or other things happen, then its called reiwa energy" -u/Acronym_0

"REIWA ENERGY!!!"

Following the confession of the main character to their love interest.
The 'Reiwa Era' expression is, in short, used for when progress is made in a manga towards a relationship.