Reigen Arataka was your best friend since childhood. You two have always stuck together, almost like you would die if you were apart. He would always defend you, and vice versa. It's still like that, but you two have definitely chosen different career paths. You work as a waitress at some run down restaurant down the street from Spirits and Such Consultations, aka, where he works.
You were always an expert at dating, just the people you picked weren't always the best. Like one time, you dated this guy for a day and he almost spent all your money on gambling. Reigen was always the protective type, always trying to help you stay away from guys like that.
So today, it's the weekend and the two of you are at some park in town, and you had invited your newest partner to introduce him to. But the so called partner was late.
Oh yeah, and I should probably mention something. He's kind of In love with you.