Even if this love of mine isn’t allowed, I just love that person too deeply... in the midst of summer break, this unspeakable love comes to a close.
1 Volume (Complete)





So the summary is actually slightly misleading combined with that cover. The "love" that's referred to in the summary is the affair that the main character (an office worker) is having with her married boss at work. The story focuses on her friendship with a young boy she happens to meet one day, after realizing her boss's wife was pregnant, and how this relationship helps her grapple with the affair itself. (This all happens in chapter one, so it's not a spoiler.)
The supernatural tag is also not just for show, and there's a slightly obvious (in my opinion) twist about who exactly the young boy is, and his relationship with our main character. It's not romantic, though, so no worries about that.
Overall, the story is a nice little one-volume short about a woman trying to grow and change as a person. It's not exactly a coming-of-age, since the main character is already an adult, but it's something close. And Ameno Sayaka is a mangaka who's always been relatively skilled at these emotional beats, so the whole thing works fairly well. A good read if you're looking for a soft and heartfelt drama.