The manga is set in the Taisho era, and centers on Masataka Tagami, a teenager who leaves his provincial home to try his luck at enrolling in a preparatory school in Tokyo. Just as he arrives in Tokyo, he is involved in a small traffic incident with the 25-year-old Soma Saiki, the scion of the Saiki family and president of the family's trading company. With Masataka's housing prospects grim, he decides to make his services available to the Saiki family as a servant, and grows closer to the young Soma, while learning more about the family's dark secrets.
(Source: Anime News Network)
— Description from AniList community (anilist.co).
