Ten hopeful singles arrive at the seaside city of Nice, looking for love. But first, they must give up their smartphones and find each other organically.

Nanami receives and writes her first letter. Maho has an unforgettable encounter at a church. Mimi and Sho grow close, but Aru's arrival stirs things up.

While exploring the city alone, Maho encounters two participants on a date. Later, everyone receives a mysterious invitation to gather at Maison Margaux.

Two groups head out on their day trips, testing their chemistry as they venture beyond Nice. Meanwhile, Tohko eagerly prepares for her very first date.

As Yudai grows increasingly fond of his date, he realizes he may have unwanted competition. Meanwhile, Kanaka surprises Sho with an impromptu suggestion.

Kanaka and Nanami go on a double date to the Alps. Aru prepares extensively for his upcoming date. Tohko musters the courage to express her feelings.

Tohko and Nanami confide in each other during an emotional breakfast. Aru's big date arrives, but he quickly realizes it's far from picture-perfect.

Slowly but surely, Nanami manages to open up to her date. Atsushi whisks his crush off to Monaco. Back in Nice, Tohko receives a cryptic letter from Yudai.

Yudai will stop at nothing to make one last confession. Later, as everyone gathers for a final dinner, tensions rise as they face the last day.

The participants drop off their last letters. Will their crushes show up at the promised location before sunset, or will they return to Japan alone?