[Prince of Tennis] Yukimura, Your Heroine Is Over There

A girl with a serious little-brother complex somehow gets transported to another world, just a few weeks before her younger brother's college entrance exams. The guy who claims to be a god tells her, "If you want to get back before your brother's exams, you have to complete the task I give you: date Yukimura Seiichi, then dump him. One day there equals one hour in your original world. You can figure out the time difference yourself." The heroine: "..." She thinks that guy who claims to be a god should add two more characters to his title. He ought to be called a lunatic. And so begins the story of our caregiving-obsessed little-brother fanatic and the darkly calculating tennis prince. The heroine (expressionless): "Yukimura, please go out with me." Yukimura (smiling): "...Classmate, please don't joke around." The heroine (completely serious): "Why would you think I'm joking?" Yukimura: "Because you don't look serious at all." The heroine: "Oh. Then I request that you date me [very] [seriously], with marriage in mind." Yukimura: "..." Ahem, this is my profile. If you're interested, feel free to follow it~~ Come on, click the smiling face on the left~~ Click, click, click~~ Let me recommend my new story, Time Cannot Leave You Behind. It's a cheerful, sweet little story about the uphill journey of a male best friend trying to become something more. Sweet romance and doting love throughout. If you're interested, go ahead and click that pretty cover on the left. It's a portal Premise: