The Shadow of the Shield

[Rewrite] Fitoria's Hero asks her to make sure the four Heroes work together or kill them. Many years later and now it is Naofumi's turn as the Shield Hero, his Wrath Shield being his strongest weapon. But when a mysterious girl appears in a Wave of Catastrophe, things start going weird, especially with his Wrath. Who is she and how is she connected to Naofumi and his shield?