Kimi No Na Wa (Your name) Explained!

Taki's Search for Mitsuha

Taki’s Search for Mitsuha

After this, they don’t switch again. Taki wants to know why. He uses his memory and generic image references to draw out the scenery of Mitsuha’s town. He doesn’t know the name.
He decides to go on a quest to find this town. Tsukasa and Okudera decide to join him, they think he’s going to meet an online friend. They go hunting but aren’t able to find much. At a diner, someone finally recognizes the drawing of the time and say it is Itomori. It is disclosed that this town was destroyed 3 years ago by a comet fragment. This is the first time we, the audience, are told that the body switching between Taki and Mitsuha was happening 3 years apart.
Taki is unable to understand how this can be. The crater caused by the comet has caused another lake to form. He pulls out his phone and sees the messages are disappearing. I’ll talk more on the disappearing messages later.
They begin to read up on the town and locate a book that has the names of all the people who died. Taki sees the names of Teshi, Sayaka and Mitsuha. This is also where were shown that Taki has been wearing the thread, from the train, as a sign of good luck.
He has no memories of how he got it or who gave it to him.