As an "adult's notebook" for learning, singer Koji Kikkawa appears with the theme of "cool adults"! The content is quite amusing! It discusses "the reason for coolness" and "sticking to oneself," but in the end, it's an advertisement for Otsuka Pharmaceutical's product, "UL・OS"! I think it's quite interesting. How about it for those who are interested? The last photo has a sticker on it that incorrectly states 1988 as the year COMPLEX was formed (lol)!