Dad's Lunch Box

パパのお弁当は世界一

Also known as Papa no Obento wa Sekai Ichi, Papa no Obentô wa Sekaiichi, Papa's Lunch Box Is the Best in the World, Papaben

Throughout the three years of high school, Midori ate the bento lunch her dad made for her every single day. And in the very last bento of high school, Midori finds a photo of "the first high school bento" along with a hand written letter from her Dad.