いつか私は、君を裏切る (Series) favorite_border

[DeepL Translation - needs review] Volume 1: Hatsukoi Hatsukoi, a lonely girl in pursuit of "why". A good-natured female teacher, Dokuzen Aikou, is fascinated by the girl. Their encounter leads to a peaceful day tinged with mystery and betrayal, and a fragile collapse. ...... A coming-of-age mystery of betrayal, spun by an up-and-coming author.

(Translator: DeepL)