Karei Hirosaki is a Manager at Saiun Dormitory, where Kazuki resides. She is also a widow, known for her kindness, calm demeanor, warmth, and gentleness.
Most of the time, you see her sweeping outside, and she always wears a mourning dress. However, the show provides limited information about her background.
Though not explicitly stated in the series, there are strong indications that the man Karei and Shino once loved is connected to Kazuki. Firstly, Karei pledges to watch over her love from afar, something she continues to do with Kazuki. Secondly, Karei's love was a Shinto priest, and Kazuki comes from a lineage of Shinto priests. Lastly, there is an overlap between Karei's love and Kazuki, as Karei reminds Shino of their pledge to watch over their love.
(Source: Wikipedia)









