Sanity Zero

Cthulhu deities invade the modern world—alien tentacles and mutated humans flood the cities; ordinary people easily succumb to corruption and descend into madness. The government establishes the 'Sanity Restoration Specialist' profession to handle all kinds of eldritch contamination incidents. The protagonist is a second-generation deity from the divine realm, and the Overlord seeks to implement a plan for 'human-deity fusion evolution'.