Where can I find Yokozawa's story?

Heres a dj .. but its not the same as the movie..
I dont remember clearly.. but someone said to me that the movie doesnt have a manga or something lika that..

http://www.mangago.zone/read-manga/sekaiichi_hatsukoi_dj_love_love_love/

there are novels for his story, just need to look for them online :)

Where online?