My Fake Girlfriend's Defending Against Their Attack

One day, a girl suddenly confessed to me. In order to reject her, I had to find a fake girlfriend. I didn’t expect that my plan to avoid trouble… would lead to an even bigger mess? The Archery Club's tsundere "Mad Dog”, the flirtatious “White Fox”, the long-black-haired “Unattainable Flower”, and… my yandere bro-con sister! How did my youthful love story come to this? (Source: Billibilli, translated)