內容簡介：3 years ago, Shuji Kojima received an email from his best friend Masaya who committed suicide due to bullying. It said "Thank you for everything. I no longer have a grudge against you". Shuji has always wondered whether he could have intervened and with a sense of regret, visits Masaya's parents on the 7th of every month, the date Masaya died. We'll explore Shuji's relationship with Masaya's parents as they attempt to help Shuji let go of the regret he feels.