The love story of 16 years old student named Josh who bumped to a weird 16 year old girl named Sari who believes in a letter that tells the story of Salome and Elias who promises a forever love under the "Blue Moon". For Josh, Sari is lunatic but there's something with her that made him decide to join her in finding if it's true and it will be a long journey going to Leyte. And Sari reunited with an old friend Kiko who has feelings with her. With Kiko as a competition, how will Josh find ways to accept that he develops his feelings for Sari? Between Kiko and Josh who will be Sari promising her love under the blue moon?