Related Series Timeline :
1 Doukyuusei [Classmates] - Prologue
2 Sotsugyousei [Graduate] - Sequel
3 Sora to Hara - Spin-off (Story of Teacher)
4 Occupation to Beloved - Mixed
5 Graduation Certificate - (Epilogue artbook)
6 Blanc - !!?? (/TДT)/
And yes.. This is the last one
blanc