"[Super Complete Edition] YouTube Compendium: How to Get 100,000 Subscribers in 6 Months" By Tatsuo Koyama Price: ¥1900 My child purchased this, but it seems to have been too difficult for them. They only flipped through it, and as shown in the third photo, the top of the cover is creased. #TatsuoKoyama #Tatsuo_Koyama #Book #Society/General"