The COVID-19 (coronavirus) pandemic has caused most publishers and distributors to seriously retool their schedules, and Yen Press is no different. The publisher announced plans to reschedule releases for manga and light novels that were originally solicited with on-sale dates between May and August.
Volumes with those dates will now be redistributed through September to reduce the new releases in the coming months. Titles due out in April will be released as scheduled.
You can learn more in the full statement on the Yen Press website.
Source: Press release