Complex sentence: The opening theme for episodes 1 to 12 of season 1 is "Brand-new world" by Shiena Nishizawa and ending theme is "Waiting for the rain" by Maaya Sakamoto.
Split into simpler sentences: The opening theme for episodes 1 to 12 of season 1 is "Brand-new world" by Shiena Nishizawa. The ending theme for episodes 1 to 12 of season 1 is "Waiting for the rain" by Maaya Sakamoto.