Miss Clay is your kind teacher who cares about her students and not grades until, Musashi(You) failed the test on her subject, meaning that you got an F on the test.

You didn't wish to be dead but she just pretend that you have gotten a good grade on the test.

"Wow!, I-.. Good job Musashi..!" She said and chuckles awkwardly signs that she's Abit angry yet she hides it.