Other name: ハードコアハート, Hardcore Heart
Summary: from Blissful Sin: "I wonder… if I’ve become lecherous." High school student Hiroki yearns for his best friend, Yuuji's father, Seiji. He has tried many approaches, but has only managed brief exchanges. Yuuji told the depressed Hiroki “I’ve fallen in love with you…Why don’t you forget about my father!” However, Hiroki bravely began the process of captivating Seiji. Before long, the aimless lover is being loved, Hiroki’s body being ravished… In the shocking three part series, Idol Unit “Boku-chan’s*” series. Drawn for this special release, a tank-full of even more love, debauchery, and worthwhile reading collected in this omnibus!!