Humanity Has Declined Season 1 Episode 7

The Fairies' Time Management (1)

As the heroine is sent by her grandfather to look for his assistant, she encounters someone who looks exactly like her. Things only get stranger as she starts to encounter a lot of deja vu and encounters more versions of herself, with no clear memory over what is happening. She soon learns it to be the work of the fairies, who are manipulating time in order to get several copies of the heroine to make sweets for them. After several loops resulting in hundreds of clones making sweets, the heroine soon encounters a village full of dogs where the assistant lies.