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[DeepL Translation - needs review] Volume 1 Introduction: The puzzle is always incomplete... What do you think, what do you want, what are you willing to do? A few years after graduating from high school, Mizuho suddenly received a phone call from ...... that announced the death of Haruka Orikuchi, a high school classmate. Although Haruka was a simple and inconspicuous girl, Mizuho learns that Haruka had been pregnant during their high school days. Moreover, Haruka's mother asks Mizuho to fi...