LOVELESS

On the first day of school, 12 years old Ritsuka Aoyagi notices his classmate, Yuiko Hawatari, tries to make friends with him. After awhile, Yuiko Hawatari tries talking to him, but instead of communicating back with her, he makes her cry and yet, she doesn't give up.
After school, there was a strange guy named Soubi Agatsuma waiting for Ritsuka by the front gate. After talking to Soubi Agatsuma, he claims that he's a friend of Ritsuka's brother, Seimei, that has recently been murdured.