KAT-TUN is part of Softbank's newest campaign 「私立スマホ中学」released today (March 1, 2018).
In this campaign, KAT-TUN teaches the subject Ethics to Junior High School students.
CM -
https://www.softbank.jp/mobile/special/sumaho-chugaku/
https://www.facebook.com/hyphensph/p...875712/?type=3
3 nin KAT-TUN looks great