A booklet packaged with Harta volume 16 at select stores. It's an anthology of one-shots centering on the theme of muscle enthusiasts. (Source: Natalie, translated)

In the *Yutkaa-kun no Buppou Seminar* series: 1. *Tenma 3000-nen* 2. *Shura no Shoutai!!* 3. *Jinrui Mi~na "Jukkairon"*

In the early 1940s, Gentaro's grandfather, Matsukichi, sneaks into his family home. All of his possessions are lavish, and his manners are dignified, giving him an air of being no ordinary man. Young Gentaro adores Matsukichi, and he even has a designated seat on his lap. Years pass, and after Matsukichi's death, Gentaro is told a shocking story by his parents!　 Who was Matsukichi, a man who was closely connected to the upheavals of Japan's turbulent times? This is a true-life essay manga by Minamoto Taro, recounting stories about his grandfather, Urushibara Matsukichi.