First I watched ep.13 of Sunred, in which Red explains how heroes get upgrades in the mid-series in order to fight more powerful enemies, and then I watched ep.23 of Max Heart where... cures receive braces.

Brilliant.

Also: the explanation is accompanied by the dramatic music, then Red says "... Deshou?", pushes the box away, and the music cuts off. It's a basic trick, but it works.