"Watashi ga Inakute mo Shiawase ni natte Kudasai" Nante, Fuzaken na.

Synopsis

As I was spending my student days alongside my beloved girlfriend, one day, she suddenly said goodbye to me. After becoming a shadow of my former self, I learned that she died after struggling with an illness. The diary I received from her family was filled with her happy memories with me. (Source: Amazon, translated)