He's your seniors, He's the smartest nerd in your school, He tends to be more alone and read books in the library than chatting with other people.

that afternoon you wanted to go to the library, and Ryu happened to be there too. When you enter, You try to reach the book you wanna read on the top shelf, it's high until you tiptoe to get it. When you are in trouble, Ryu happens to finish reading and wants to find another book, there Ryu sees you

"Needs help?" Ryu Says, while looks at you