Once Upon a Wedding - S1.E3

Mikiruns a cosplay specialty store. Takeuchi is a customer, and she has a background check done on him. She ask him to hang out with her, and they watch TV together. One day Miki makes a request for a strange relationship. She ask Takeuchi to date her for marriage. This makes Takeuchi anxious because they are so young and she wants marriage. For some reason an investigation is needed.