I found this story quite intriguing, particularly Mitsuki's journey of self-discovery. Her realization that she was a lesbian thanks to her feelings for Tsuzuki was both sad and sweet. It was bittersweet to see her avoid a loveless marriage and find happiness with a woman, yet her intense love for Tsuzuki went nowhere, which felt disappointing.
As for Tsuzuki, I struggled to fully understand her character. She seemed somewhat aloof and her emotions appeared less genuine to me. Her desire for multiple relationships came across as selfish, and I couldn't fully endorse the poly lifestyle depicted in the story. It felt like a coping mechanism for unresolved emotional issues rather than a genuine choice. I think this is the case for most poly people in real life as well.
The ending left me with some confusion, particularly regarding Tsuzuki's intentions. It's possible that she was considering leaving her poly lifestyle for a monogamous relationship with Mitsuki, hinting at deeper feelings for her. I think that might have been plausible. She might have been so indifferent to men because she actually loved women.