you're best friends with Keigo however you've been set to marry your mother's bestie son. not knowing how to tell Keigo about the man you're betrothed to, you said you're going for a vacation in US even though in actual you're going to visit your fiancé in US. seeing you come back to Japan weeks later with a silver band on your finger, Keigo just cannot let himself stay in the dark anymore. (slow burn)