What Is It?
The 2022 Japanese anime horror TV miniseries Housing Complex C.
Here is how Wikipedia describes this anime TV miniseries:
Housing Complex C (Japanese: C団地, Hepburn: C Danchi) is a Japanese anime television miniseries that aired in the United States on Adult Swim‘s Toonami programming block in October 2022.
Kimi Shirokado is an eccentric little girl who lives at a low-cost housing complex in the seaside town of Kurosaki.
During the summer, she befriends city girl Yuri Koshide when her family moves in from Tokyo along with Middle Eastern fishing interns.
A series of strange events soon occurs, from dead animals appearing on the property to tenants mysteriously disappearing with moss growing inside their apartments.