This voice, this song, this echo. Through this sound, this is the melody of two people coming together both heart and body. Guitarist Kouhei is always fighting with his other band members due to wanting to go a different direction. Then while he’s at a local music venue, he hears an incredible singing voice and falls in love at first “sound.” He doesn’t know who the voice belongs to or where it came from, but when X mysteriously appears, Kouhei unconsciously gets hard. He searches desperately to find him again, but his only clues were X’s voice and a tattoo on his left arm. After several months with no luck, he runs into X by chance at the convenience store! Kouhei starts hitting on the man who introduces himself as “Rei,” only to be completely rejected…

Yakuza, the brutally yakuza cadre, and his watchman. Even if he had sex with Saffle, Yuji was always on the side and played a role, but he had been arguing for ten years to make him own. On the other hand, he said, "I can't sleep only with you." The relationship between the two, which seemed to continue like this, would change significantly depending on an event ... Is Yuji able to catch Yuki? And why is Yuki stubbornly refusing Yuji?

Saeki Subaru is a widower who completely dotes on his young son, Sora. He shows himself to be a chivalrous man, who strives to live in a more righteous world. But in reality, he's the right-hand man of a yakuza boss, with a male lover. At Sora's nursery school, he meets the new teacher, Kousei, and they quickly become close. However, Saeki gradually starts to feel that an icy flame is lurking in Kousei's eyes…?

Always-surrounded-by-friends Ryuunosuke and lone wolf Kagetora are leaders of opposing teams and they have a cat-and-dog relationship. One day, they end up doing erotic things: "This can't be. I'm sharing a secret with this guy." There are also plans to move far away, and things get complicated. As these two who cannot seem to grow up consider their friends, hometown, family and their feelings for each other, they take their first clumsy steps into love. This volume also contains the story of adult love between a younger manga artist and his Do-M editor! Even though his body was held captive "for the sake of producing ero manga", the manga artist discovers a pleasure switch that even he didn't know about…

Hundreds of years ago, 48 sexual positions were created and named. It is the equivalent to the Japanese kamasutra. These moves were likely devised during the Edo period (1603-1868), reflecting the 48 set of moves that Sumo wrestling recognizes. 48 different manga artists came together and created oneshots for each different position. In this first volume, 24 of those positions are featured.

1: Rei no Otoko 「れいの男」 by Harada 2: Koide-kun no Junan 「小出クンの受難」 by Sakurai Ryo 3: Ofisu de Ren'ai Zangyou-chuu 「オフィスで恋愛残業中」 by Kitazawa Kyou 4: Shitagau Hodo ni「したがうほどに」 by Fujimura Ayao 5: GALLOP!!「GALLOP！！」 by Est Em 6: Katappashi kara Zenbu Ai 「片っ端からぜんぶ愛」 by Kakine 7: Sono Hitomi ni Torawareru 「その瞳に捕われる」 by Sasamura Gou 8: Sachiku Naito「社畜ナイト」 by Isaki Rika 9: Shachikuna Ore to Sakushina Kouhai「社畜な俺と策士な後輩」 by Yoshi 10: Renai wa Zangyou no Ato de「恋愛は残業のあとで」 by Kitano Megumi