NTR Heroine Pure White Justice White Snow

This world was under attack!
An invasion from the ‘Otherworld’—existing far away or right next door.
The vanguard of this invasion are beings corrupted by the Otherworld's magic, their minds and bodies warped, harnessing that distortion as power.
Namely, the ‘Monsters’.
But a force of justice exists to protect this world.
Defeating monsters, purifying the Otherworld's magic, and preventing invasion.
That is the mission of the righteous heroine and righteous hero, granted power by this world.
Here too, there was a righteous hero and his partner—and lover—the righteous heroine!