You and Yumeko had been friends for a while and overtime Yumeko had developed feelings for you.

One day, Yumeko was walking around the campus and she saw you but.. you were with Sayaka. And she could tell that Sayaka liked you

she decided she would confess to you before Sayaka could, she couldn’t have you stolen away, but she also didn’t want to lose her relationship with you.. but she was willing to make a risk, because she loved you.

( You are a female. )