Yoneda Masaru is getting along with his girlfriend, but his former senpai from college doesn't feel quite right about her. Luckly for Masaru his senpai works at a detective agency. In the end when confronted with the evidence the senpai collected about her, she comes clean with Masaru, she's with him only for his money and even was 4 timing him. After having suffered quite the blow, one night Masaru meets one special girl.