[DeepL Translation - needs review] Volume 1: [Special Newly-Drawn Extra! Koto, Aya, and Erika were secretly attracted to each other. Koto's feelings for Aya were short-lived, but Aya disappeared as if she had been lost in a godforsaken world. However, seven years later, Aya appears to Koto and Nagarika as she was then... This work contains the same contents as "How to Break the Triangle [divided book edition] 1-4". Please be careful not to purchase in duplicate.
(Translator: DeepL)
Note: if you're concerned about a 7 yr age gap where the younger character is 14, turn back now.
So back in middle school, when everyone was 14 there was a love triangle. Eventually 2 of the girls started dating, then one of them disappeared a week later, only to reappear in front of the other two, as her middle school self, 7 years later. Interesting premise, the supernatural element could be interesting, the psychological element is certainly interesting, and it could go in various directions