Rascal Does Not Dream of His Girlfriend (light novel)

AN UNBELIEVABLE ANNOUNCEMENT. The day Sakuta dreamed about is finally here. His search for Touko Kirishima has led him to a music festival where Mai is performing. Filled with concern and anticipation, he attends to figure out who the mysterious singer is and how she's connected to Mai. Instead, he starts seeing strange things, like multiple Mais. And naturally, the weirdness doesn't stop there. Will Sakuta be able to unravel this latest mystery and finally keep Mai safe.