The film opens in 2023 with longtime friends Sano and Miyata visiting a resort hotel at
Atami on the
Izu peninsula in the final days before it closes down. Sano is mourning the very recent death of his wife Nagi, and his behaviour strains the relationship with Miyata, until Miyata leaves. The film then slips back in time to 2018, exactly five years earlier, when we see Nagi in the same room as the boys will occupy in the future. She was supposed to be travelling with a friend, but has been let down. She falls in with Sano and Miyata who are also at the hotel. The three of them explore the town. Later Sano and Nagi go clubbing together and wander through the evening chatting. They arrange to meet again the following morning before returning home. Next morning, Nagi forgets the rendezvous, but Sano finds her after they have both checked out of the hotel. Back in 2023, the hotel is finally closed down and the staff move on. Apart from the three protagonists, a number of significant elements link the two timelines: a red baseball cap; a Vietnamese chambermaid (Anh); and the
Bobby Darin song,
Beyond the Sea. The final scene makes the connection explicit. == Main cast ==