As Shingen prepares to bid farewell to all when he's about to fly off into the night, thanking Alan for his gratitude and for trusting him. As a gesture of his good faith, Shingen offers his sword to Alan for safekeeping when Alan forbids it,

"Keep it, either way, it doesn't suit me. Anyway, you're going to need it very soon"

"I don't understand Alan-San"

"See, we can't let you go wander off into the night, lest any poor chap falls victim to your bloodlust"

"But I already confessed, I never harmed a single soul here, I only fed on cattle blood which explains Alan's initial investigation.

"We might have some use for a man like your abilities. After everything that has come to the light, my organization proposed to set up S.T.O.P which stands for Strategic Intervention Taskforce of All things Paranormal."

"Sounds like an adventure"

"Are you in or are you out?"

"Very well Alan-San, if this is my destiny then so be it" Shingen agrees finally satisfied that his cursed life has some purpose to fulfill.