Koimonogatari

The lesson to take home from this is to trust no one. Because the teller of the tale, who has been summoned by the heroine to defuse the situation, despite having been her nemesis since the very outset of the series, is—in the absence of the equally shady adult, Oshino, who at least was an expert—none other than his college frenemy, the fake ghostbuster who doesn’t believe in ghosts, the shameless swindler Deishuu Kaiki.