I wanted to hear your voice before I disappeared from this world / ユニモン

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

"Hey, can you sing for me?" A high school girl, calm sea, who pretends not to be able to say anything, suddenly gets a call from the popular class member Tobari. Although they were initially suspicious, they gradually become more friendly and promise to accomplish what they want to do by graduation. However, one day before graduation, Tobari suddenly transfers to another school. A few years later, when calm sea became a member of society, he relied on letters from him every year to live, but when he met his classmates at the time, he learned the shocking truth --