Kamen no Fugou to Emma no Himitsu

I'm sure we'll meet again, that's how we parted, but I'm afraid to see him again… Emma, an accountant, followed her mother's instructions and spent her days humble and focused on her work. When a friend invited her to a costume party, she met a charming man by chance and spent a night of passion with him, hiding her true face. When their dream came to an end, they tattooed one half of a heart on each other's body as a token of the night, in case they could see each other again. When Emma went to the company where she was sent as a researcher, she found that Jonah, the CEO, was that man! It's great to see him again, but the woman he loves is the wild woman of that night, and I can't tell him who I really am.