There Can Be Oni One

There Can Be Oni One is the Doom Eternal event, extending from April 1 to April 22, 2021. Its items belong to Series 11. Its contents have also featured as part of the Winter Mega Event spanning from December 8, 2022, to March 9, 2023. Its items have so far not been placed into any premium pack. The items belonging to this series initially stated the name of Series 11 as the "Cherry Blossom" series instead of "There Can Be Oni One", but this was eventually corrected in an update. The series is themed around Japanese.

The original run of this series was supposed to extend to April 29. This was the only series to ever be abridged rather than extended, causing some players to miss out on it entirely. With almost no warning given, Bethesda cut the period short by an entire week and instead made April 15 to 22 a Double XP period. This abrupt change was evidently made to accommodate the addition of "ICYMI: Series 1" into the schedule so that Bethesda could begin selling the cosmetics as premium items despite developer Hugo Martin's previous assurance that they were to be strictly earned through gameplay.