Four and a half myth series

The story is told in the first person of the protagonist. "I" (voiced by Shintaro Asanuma) is a third-year student at Kyoto University. I originally looked forward to a rosy and colorful university life, and hoped that I could make a beautiful girlfriend with flowing black hair. However, things went against expectations. The protagonist experienced a failed love relationship and had very few friends around him. The protagonist's only friend, Ozu (voiced by Yuyuki Yoshino), looks like a monster and enjoys playing tricks on lovers. The protagonist often spurns Ozu, but cannot live without him. Then the protagonist meets his junior sister Akashi (voiced by Maaya Sakamoto), who is a black-haired girl with a cold personality. It was precisely because I chose the tennis club that I failed in the two years of college. So "I" imagined that if I had chosen another club when I entered school, would I have experienced a completely different college life? From the perspective of parallel time and space, this work revolves around the protagonist starting from the beginning of choosing a club as a freshman, choosing a variety of different clubs, and developing a different youth story.