This guy (whose surname is Satō, by the way) used to live with a pet Reimu that could've been deducted as having been killed by some strays (his home sign read "Satō residence, with Reimu", but "Reimu" had been crossed out). Coincidentally, the winged fucking bag of rotten puke (WFBoRP) claimed that the nicehead koReimu was born from a pet yukkuri that was killed by its clan or family or whatever; and now when facing Satō, WFBoRP brought up that same story. Evidently shaken, he took in both WFBoRP and the koReimu for some easily predictable justice and vengeance.