BanG Dream! Morfonication

A special 2-episode animation featuring Morfonica!
The Morfonica members are excited for the concert-packed summer vacation. Meanwhile, Toko secretly plans what she calls the "Summer Morfonica Plan" with Nanami and Tsukushi.
(Source: YouTube Description)
Note: Announced at Bandori Channel☆'s Day 1 "Garupa 5th Anniversary Fan Festa in Akihabara" live stream.