It was announced during their Key Channel special that the Summer Pockets visual novel’s anime adaptation is currently in active production. There is no timetable as to when the anime will air as of yet.
The visual novel was released in June 2018 for PC and again in English on Steam in February 2020. An anime adaptation was confirmed as early as 2017 and was, once again, affirmed in January of this year.
According to the official Twitter account, more information on the anime adaptation is coming in the near future.
Key describes the story of Summer Pockets as follows:
From the creators of Angel Beats! and CLANNAD, Key, comes their latest emotional, award-winning journey. Follow protagonist Takahara Hairi as he travels to the secluded island Torishirojima, where he rediscovers what it means to enjoy summer vacation.
Source: Crunchyroll