Cool na Doukyuusei no 10-nengo
クールな同級生の10年後
Prequel
The Cool Classmate Whose Favorability Gradually Changes
だんだん好感度が変わっていくクールな同級生
manga
60It's a prequel that tells story that happened before the story "The Cool Classmate ◯◯ Years Later...". Prequel was published after "The Cool Classmate ◯◯ Years Later..." story.
Cameo
Ignorant Girl ◯◯ Years Later...
Muchina Kanojo no ◯◯ Nengo…· 無知な彼女の◯◯年後
manga
65
This is a story about growing from ignorance to wisdom... (Source: Pixiv, translated)