OK time for me to post this as usual!
I will explain and I will put the games in CHRONOLOGICAL ORDER of the STORY:
Funbag Fantasy 3 IF (Apparently we don't need 3 since this is an EXTENDED Version) (According to the info I found, this is the Origin Story so this should be played first if you care about Chronology) (Please do NOT assume that IF = Alternate Story. IF = IMPROVED STORY) (Takes place CENTURIES before 1)
https://f95zone.to/threads/funbag-fantasy-3if-final-waffle.81760/
Funbag Fantasy 4 (Prequel to 2 and 3's Sequel according to VNDB) (Takes place 400 years BEFORE 1)
(YOU ARE HERE)
Funbag Fantasy 2 (PREQUEL to Funbag Fantasy 1)
(Ruin, Shamsiel's DAD) (Going to assume everyone played 2)
https://f95zone.to/threads/funbag-fantasy-2-final-waffle.41001/
Funbag Fantasy 2 IF (Remake of Funbag Fantasy 2 with a BETTER story. So sad that Mangagamers did not localize this one instead) (Takes place 100 years before 1)
Funbag Fantasy 1 (The Original Game)
https://f95zone.to/threads/funbag-fantasy-final-waffle.541/
Funbag Fantasy 1: Sideboob Story (Sequel to Funbag Fantasy 1)
https://f95zone.to/threads/funbag-fantasy-sideboob-story-final-waffle.10880/
Funbag Fantasy 1: Sideboob Story 2 (Sequel to Funbag Fantasy 1: Sideboob Story)
https://f95zone.to/threads/funbag-fantasy-sideboob-story-2-final-waffle.47866/
Funbag Fantasy 1: Sideboob Story 2 DLCs (Various Extra Content) (Sequels to Funbag Fantasy 1: Sideboob Story 2, not out in English yet)
Funbag Sorcery (Or Kyonyuu Majo) (Very Distant Sequel to 1) (Not out in English yet)