The heroine is outnumbered; Sailor Paladin VS Demon Legion; Misumi Rei SPSF-27

The chosen paladin, the Sailor Paladin—Rei Astrea—is the one wielded by the holy sword Excalibur. Excalibur can convert a paladin's spiritual energy into power. In other words, as long as the paladin's heart doesn't break, Excalibur will grant the wielder power. The demon Gilgamesh is plotting to seize Excalibur for himself. Gilgamesh summons five high-ranking demons, cornering the Sailor Paladin. Outnumbered and outmatched, what will become of the Sailor Paladin...? [BAD END]