Sure Chuuya's sentimental but dazai managed to track down all of Chuuya's baby teeth since they met at fifteen. He also has an entire shelf filled with random things he collected from Chuuya, including locks of hair sorted and labeled by each month they were taken. He has at least a couple hundred books, some of pictures and some journals, keeping record of data such as how many breaths Chuuya took on Saturday September 20th.