A memory you can barely remember, history so old, a voice behind you…

Theme 1:

メメント Memento

An enormous monster(s) that revive again from oblivion!

Theme 2:

センチュリオン Centurion

Iron knights that start up with the power of bonds!

Theme 3:

ヴァルモニカ Valmonica

The voices of angels and demons influence the tides of battle!

Source