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Related Series Timeline :
1 Doukyuusei [Classmates] - Prologue
2 Sotsugyousei [Graduate] - Sequel
3 Doukyuusei & Sotsugyousei Fanbook (Side story)
4 Sora to Hara - Spin-off (Story of Teacher)
5 Occupation to Beloved - Mixed
6 Graduation Certificate - (Epilogue artbook)
7 Blanc
8 Futarigurashi