I wanted to know if she ends up happy, so I search for chapter 150. Instead, I found that there seems to be a sixth book, containing bangaihen/ extra chapters.
Year is 2025 and biribiri has finished the translation (though not much to translate, chapter names mostly). I came here from another mangaka's work, https://mangadex.org/title/fb0f33ca-5b0e-4915-b1b5-ad03482714a5/shissou-sengen
That one is also about single OL, but with plot and dialogues. So I considered this one as a light version, 4koma style.
It was a good easy and fun read, I could relate in half of chapters. Thanks