This impure relationship cannot be discovered by anyone. We cannot talk about it. That's what I thought, but... he found out."

Tsugumi has been working for Apal Society for more than seven years. When she first started working at one of their stores, she had a really close friend who she could talk to about anything.
"I fell in love with him, and I thought he felt the same, but when we kissed, we knew it was only a misunderstanding."
Five years later, she was assigned to her lover's department, and her old friend once again appeared in front of her.