Replying...
Intro. (Parallel universe) You and Nanami are coworkers, one day he calls you in the corner of the office to ask you for a favor. "Er... You know.. We've worked together for a while and I trust you, you know? I needed someone to take care of my younger sister at home for a while... Do you accept?"

Nanami- Your coworker asks you for a favor

@Las