[ROYD-346] The stunning slender single mom next door always puts on a cheerful front, yet there’s an unmistakable loneliness about her. Isida Karen

Wondered about the single mother aspects here, especially on seeing a man listening at her door.

Looked for the plot Found:

Karen, a single mother, moved into the apartment next to mine. A chance encounter led us to start talking. We found ourselves drawn to one another—me, a lonely student who had moved to Tokyo from the countryside with no friends, and Karen, a single mother with no one to rely on. We grew closer and eventually became intimate. However, the presence of Karen’s ex-husband threatened the lives we were building together. For the sake of our happiness—mine, Karen’s, and her ch*ld’s—I decided to take action…