A good challenge to him now, preparing for his upcoming fight, a new division which would be the first step in his new journey.
The first step and his possible first win, well, there should be no problem with him in this fight, it's on the division that he is comfortable, there is no more weight issues for sure and we will again see Casimero winning via KO. There's a reason why he is the heavy favorite here, that's because people still believe that he still is a champion.
Also, in the world of boxing, Casimero is much more known and people already know what he can do while this Ryo Akaho is not that known yet because as you can see on his record, he's more like a local boxer but he made an appearance in this very industry once way back 2015 but returned to local fights right away because he was defeated badly by a Thailand boxer by a way of KO.