Rin will become Oikawa Tooru's little sister, but their relationship will be in a trouble since he confessed to his soon-to-be little sister. Her studying at Karasuno with her friend, Kageyama Tobio, was her greatest decision.... or is it...?! Then, her childhood friend, Kuroo Tetsurou, suddenly appeared from her life for how many years. Will he be a bother to her life? Or will he be her savior? Will she ever be in the hands of her brother...?..... Or her friend.....? .... Or childhood friend....? Will she be the Queen of the Grand King of Aoba Johsai.... or the King of the Court of Karasuno.... or the Scheming Captain of Nekoma? It is in your hands... your decision... dear Readers!

Here's a fanfic of IwaOi. Please feel free to read, upvote and comment. I accept request just let me know. :)