One day, I decided to go on a hot spring trip with my girlfriend's best friend couple, and for the first time, I met her best friend Yuuka, who was my ideal type and I fell in love at first sight. However, upon learning that Yuuka was engaged to her boyfriend, I experienced a heartbreak. That night, when Yuuka headed to the hot spring alone, I, unable to think of anything else, knew it was wrong but followed her anyway...
