Hue of Scarlet

Kaey Livre was your regular cook in a michelin star restaurant. While she was on her way to work, she fell into a manhole. An unknown person suddenly appeared and deemed her as an extractor to complete a quest to collect all of the Scarlet crytals from every specific man she'll meet in her journey.
The unknown person said, You need the liquid of a man who has the scarlet and you're going to extract it: To extract means to sleep with them.
Kaey couldn't believe what kind ridiculous quest it is: In hopes she could go back to her world, She decided to adhere the instructions given to her by the unknown person to complete the quest that she needs to fulfill.
This story depicts Kaey's journey with various men she slept with in order to accumulate the 7 scarlets.