What was the first Japanese book that you were able to finish?

My first manga was ハイキュー!! :volleyball:
My first book was 氷菓 (ひょうか), which I read with the book club. Not only was it hard because of the first book syndrome, but also because it’s in the genre of mystery :sweat_smile: Not so strangely, some of the foreshadowing went over my head.