It was the last college year, and the first semester was coming to an end, so the students asked the head of the college to hold a semi-prom, so as to celebrate the first half of the college year's end.

After some back and forth bantering, the head decided that the theme of the prom was going to be masquerade themed.

And that was how San ended up in a ballroom with dim lights, in a white suit and a white mask with a flower on the side, only his black eyes shining in the dark.