2015.03
Yggdrasill （のちのAthena）GRAND OPEN
2015.10
Norn by Yggdrasill GRAND OPEN
2016.01
拡大移転 Group Yggdrasill 創立
2017.10
Zeus by Yggdrasill GRAND OPEN
2018.02
Zeus by Yggdrasill 拡大移転
2018.02
Artemis by Yggdrasill GRAND OPEN
