I absolutely love a certain romantic comedy manga. However, the heroine I like is... a side character, an underdog heroine who will never end up with the protagonist. One day, I got run over by a truck and woke up as the protagonist's best friend in the manga. I thought it was just a dream, but I possessed the best friend and found myself alone with my favorite heroine in a classroom. Without hesitation, I confessed my love to her. Since it was a dream, I thought I wouldn't have any regrets even if I woke up. But... I can't wake up? It's just a normal day now? Did I really reincarnate as this character? This is the story of how I will make my favorite tsundere heroine happy, no matter what.