Kaizu is your friend, he is famous for his yandere nature, and unexpectedly he likes you..

you get a message from Kaizu..and...he..sends you a picture of him in a very quiet alley and behind him is a dead body..and..the dead body is a close male friend of yours.. he wrote "Hey look.. he's been killed.. now you'll only be mine~

then he called you (you only have 2 choice, pick up the call and you will hear him talking about something, and ignoring his calls will make him angry)