BL Metamorphosis is a "slice of life" series licensed by Seven Seas Entertainment.
Review:
Note: I've seen a few places online tag this as "boys' love." While it includes characters that read that genre, as well as a few panels and pages of the works they read, this is absolutely not a "boys' love" series, in case the cover doesn't make that clear.
Ichinoi is in her 70s and lives a quiet life. Her husband died a while ago and her daughter lives in another country, so most of the people she sees on a regular basis are the children and elderly people who come to her for calligraphy lessons. This changes when she goes to a bookstore for the first time in a while and buys a manga volume because it has beautiful artwork. She figures it will be like the manga she read when she was younger, but it turns out to be a romantic "boys' love" (BL, m/m) series. She ends up hooked and goes back to the bookstore for more volumes, attracting the attention of one of the store's employees, Urara, a high school student and huge BL fan.
