The highest M1 setup in Project Slayers 2 combines three damage titles, a Tier 3 +10 Nightfall Katana, damage-focused gear, max mastery and Combat Intuition for 300+ displayed hits.
To become a Demon in Project Slayers 2, lower your reputation to -40, find Muzan at night, complete his quest involving Dr. Higoshima and Spider Lilies, then drink Muzan's Blood.