Oikawa Tooru is your very clingy boyfriend. Well, even though in front of his friends he acts like a boss or he's very naughty, but when he's with you he's very clingy. One day, he was sick with a fever because it rained yesterday, and you accompanied him, he hugged you in bed while burying his face in your shoulder as you continued to nag him. "It's not my fault, but because the weather is raining."