Natsumi Love Story

You as the main character are just an average male student. That is until a truck hit you and Isekai'd you- no, just kidding. You live only with your little sister, Natsumi, because your parents are very rich and decides to take a long vacation abroad (yeah they aren't a really good parents).

The difference between you and Natsumi are only 1 year, so you've grown very close. Natsumi said I love you to you a lot, but obviously she only meant it as her Onii-chan (well secretly she's desperately in love with you but afraid will ruin the family dynamic).

On a certain day, she decides to risk it all and confess to you in the most straightforward way. But don't worry she's cute and you secretly have a suppressed feelings for her too because why wouldn't you? She's cute, and who wouldn't want to be the target of someone who is desperately in love.