彼女は友達ですか？　恋人ですか？　それともトメフレですか？　Ｗ

The stories and heroines are completely separate for each protagonist.

Kashiwaba Yuki arc:
The season is late fall and the tomefure girls are still staying at Yuki's house.
One day, Sakurako came up with an idea to go to the Halloween event hosted at a famous theme park. Everyone else protested, as they had no way of getting tickets on such a quick notice, but then Sayaka pulled something out of her bag...