Please take a look at the PR! ] BSS (I liked it first) is a situation in which another person preempts a person who is unrequited love who does not convey his feelings and is not in a romantic relationship. It's similar to NTR, but since no romantic relationship has been established, no one has a fault, and you can enjoy strong self-loathing and depressive erection. This work is a drama about a man who can't do anything because he has a romantic relationship with his best friend before telling his feelings to his favorite girl who is the royal road situation of BSS.