Chill, none of them left.
Johnny’s official website, Johnny’s Net, have updated their “Artist” section with new additions. Kazama Shunsuke, Yara Tomoyuki, Hasegawa Jun, and Sano Mizuki now have their own Johnny’s webpage. The four mentioned didn’t have any CD debut and they are not part of any Johnny’s Jr. group, but they have been active in acting and in choreography for a long time. Their profiles and activities used to be listed under the “Johnny’s Jr.” section; however, all of that have changed as these four now have their own page together with their profile, bio, discography, etc.
Now that Kazama, Yara, Hasegawa, and Sano have their own page, they are now considered graduates of Johnny’s Junior.