A new anime for "Is the Order a Rabbit?" (Gochiusa) has been announced at the 10th anniversary event. This marks the return of the anime series after approximately 4 years and 2 months since the end of the 3rd season in December 2020. The 10th anniversary event is available for paid streaming until March 7th, and commemorative goods will be available for pre-order online starting March 17th.
Source: natalie.mu