According to Our Butler (2019)

うちの執事が言うことには

Master Kaei, the heir to the affluent and well-regarded Karasuma family, is back at home in Japan after a period of studying in the United Kingdom. Back at the mansion he has Kisaragi Soma to serve him. Soma is efficient and intelligent beyond his station. There is something unusual afoot and the two men need to counter it.

Production

TV Asahi · Toei Company · Asahi Broadcasting Corporation · Quaras · Toei Video Company · Nagoya Broadcasting Network · Toei Tokyo · Nippan Group Holdings · Yomiuri Shimbun Company · Aeon Entertainment · J Storm