Hoshitani unexpectedly comes across a love affair between his gym teacher and his frivolous classmate, Kashiwase, and becomes interested in him thereafter. When he finds himself alone with Kashiwase, Kashiwase teases him, but Hoshitani begins to notice the loneliness between the cracks of his confident appearance…

A university student is threatened by an unknown old man. "I hate people like you! Your fate is to die," said the man with an undisguised persecution complex. "To escape this hurt, I'll do only enjoyable things 'till my end!" he argues, in his extreme desperation. In the midst of his delusions, the man propositions him, saying, "Do you want to have sex?" while he takes off his clothes. Then, little by little, he begins to find the suffering face of the man cute?! "Welcome home! The rice will be done in 30 minutes, so shall we have sex?" "You should hurry up and escape from here…!" Can love bloom in this lifestyle of confinement?

While holding a deep loneliness in his heart that he refuses to acknowledge, Yoshiki cares for his younger brother with the fiercest tenacity. At the same time, he sells his body to men, and despite the ridicule, he relies on their daily needs. Amidst this lifestyle, he runs into a handsome younger man named Katou and begins to rely on him, while being manipulated as well.

Volume 1 (2012/6/25) #Cover illustration: Aniya Yuiji 1. Toyed. by Aniya Yuiji 2. Love or Kick! by Mineshima Nawako 3. Jyoukyou Monogatari (ジョーキョー物語) by Nimoda Ai 4. Boku wa Anata ni Koi wo Suru (僕はあなたに恋をする) by Ichikawa Kei 5. Red Hot Sweet by Yamane Musashi 6. Ohirusagari no Hana no Kimi (御昼下がりの華の君) by SANKAKUSHA Pie 7. Koosuke-san, Zenra de Taiki! no Maki (コースケさん、全裸de待機!の巻) by Yamawomi 8. Sono Uso wa Kuchihodo ni Shinijitsu wo (その嘘は口ほどに真実を) by Yuki Ringo 9. Aotenjou no Killing Joke (青天井のキリング・ジョーク) by ISONO Funa 10. Kimishigure (キミシグレ) by Jaryuu Dokuro 11. Chronic (クロニック) by Kashio Volume 2: "Erotoro R18" (エロとろ R18; 2013/6/28) #Cover illustration: Aniya Yuiji 1. Sweet♡Sweat♡Monkey by Aniya Yuiji 2. Saigo no Hito (最後のひと) by Psyche Delico A subordinate who’s crazy about virgins takes his boss’s first time. 3. Saiminjutsu Nyuumon (催眠術入門) by Kashio 4. Kaze no Sukima (風の隙間) by Ichikawa Kei 5. Three Piece! by Nimoda Ai 6. Ore, Higaisha (おれ、被喜者) by Kimura Hidesato 7. Oh My Chubby,baby! by Mineshima Nawako 8. Tenshiban no Ue (展翅板の上) by SATO Nishi 9. Sickly by Yamane Musashi 10. Help? by Yashiko 11. Henai (変愛) by Harada Volume 3: "Erotoro R18 ver.SS" (エロとろ R18 ver.SS; 2014/8/9) #Cover illustration: Aniya Yuiji 1. Fuuzokugurui deshita ga Toshishita Gakusei no Koibito ga Dekimashita (風俗狂いでしたが年下学生の恋人ができました) by Psyche Delico 2. Nurui Otoko (ヌルイ男) by Aniya Yuiji 3. 7-ji 32-pun 7-ryoume no Kimi (七時三十二分七両目の君) by Kashio 4. Henai: Maotokohen (変愛 間男変) by Harada 5. Kairaku Loop (快楽ループ) by YAMANE Musashi 6. S dakara tte Namenna yo! (Sだからってなめんなよ!) by Nimoda Ai 7. Koroshiya no Takaragai (殺し屋の宝貝) by NATORI Isato 8. Koi to wa Kinaru Mono (恋とは奇なるもの) by Mineshima Nawako 9. Kajima-kun no Shiranai Nichijou (鹿島くんの知らない日常) by Kimura Hidesato 10. Live by YASHIKI Eigo 11. Namae sae Iwanai (名前さえ言わない) byOKADA Kou 12. Furueru Mune no. (ふるえるむねの。) by COCONOE Ricoco 13. 24-jikan Ireppanashi Practice (24時間挿れっぱなしプラクティス) Purugaria 14. Ikujinashi no Spectator (いくじなしのスペクテイター) by YAMAMOTO Ataru 15. Kanojo nano ni Otoko (彼女なのに男) by Inutoki & Syohei 16. Kiyoku Tadashiku Kashikou Renai! (清く正しく賢く恋愛!) by Yashiko Volume 4: "Erotoro R18: Hatsukoi" (エロとろ R18 ～初恋～; 2015/6/10) #Cover illustration: Aniya Yuiji 1. Abenobashi hai ro no Jinrui (あべの橋、灰色の人類) (The Gray Humanity of Abenobashi) by Kimura Hidesato Story of a guy doing lil yakuza jobs and his chance meeting with a guy named Megumi. 2. Tonari ni Sunderu Neko no Koto (隣に住んでる猫のこと) by Psyche Delico 3. Ezaki Shounen no Yuuutsu (江崎少年の憂鬱) by Kashio 4. First Love? wo Mouichido (ファーストラブ?をもう一度) by Yamawomi 5. 0-ten Manten (0点満点) by Emao 6. Sen wo Kaku (線を書く) by SAKAMOTO Aki 7. Boku wa Ninkimono (ボクは人気者) by Inutoki & Syohei Prequel to a story in Ringo, Ki kara Ochiru 8. Koi ni Ochite Gomennasai (恋におちてごめんなさい) (Sorry for Falling in Love) by Aniya Yuiji 9. Afureru Moreru (あふれる漏れる) by Yashiko 10. Chigireta Te no Naka (ちぎれたてのなか) by COCONOE Ricoco 11. Suimenka (スイメンカ) by Harada

1) "Zangai wa Asatte no Hou". by Emao 2) "Zutto Zutsuu" by Moriyo 3) "Namimori Miya-chan 250yen" by Kimura Hidesato I fell in love with Miya-chan. We started going out. Because I love him, I decided to have sex with him 4) "A Robot Token" by Taratsumi John 5) "Nibiki no Gesshu" by Ido Gibou 6) "Sara Yashiki" by Kajimoto Reika 7) "Isonsei" by Kisayuki 8) "Wakarete Mosuki na Hito" by Hazu Nikko 9) "Trauma wa Moemasu Yone" by Yumuko 10) "Ai no Marking" by Yamada Rock ?You?re my number one. Is that not enough for you? 11) "Koi to wa Itai Mono Desu ne" by Akazaki Yuki 12) "Itami wa Aidesu!" by Susugu 13) "Erotomania" by Narazaki Neneko 14) "Shinkokuna Error ga Hassei Shimashita" by Akahoshi Jake 15) "Soshitsu Ari!" by Shibito Koiwazurai 16) "Kimi no Koibito no Hanashi" by Isaka Juugorou 17) "Test Play" by Ichikawa Kei A couple's relaxed routine is disrupted when the one partner proposes a new kind of play. To his surprise, his significant other discovers a higher affinity to his role than expected. 18) "Iyayo Iyayo mo Wari to Yoi Toki ga Aru" by Mamemu 19) "Gogo 11-ji 15-bu Ashi no Summer" by Purugaria 20) "Roomshare no Hajimekata" by Nick/Nikku 21) "Yoake no Shiroi Milk" by Kagurazaka Hanko 22) "Itakute Moeru Kanbyou Ecchi no Susume" by Sasaki Ima 23) "Aitsu wa Kirawarete iru" by Puruchome 24) "Honjitsu no Loser" by Kasu 25) "Yasashii Itami" by Hasumi Shiro 27) "Koppa Mijin" by Shimaji 28) "Sekai de Ichiban Itoshiteru" by Konjiki Runa 29) "Yoiko no Asobi" by Sunako 30) "Akuheki Logic" by Yunopanchako

The stories are situated to a research laboratory where the people who are alive and not infected by the disease try to survive while an overwhelming amount of zombies roam around the research facility, making it impossible to escape. 1: Yours, Even After Death 「死後も君のもの」 – Usui Ryu 2: That Man, Being A Mortal 「その男、死に損ないにつき。」– Chihaya Hino 3: Bottom Of The Pitch Black Darkness 「真っ暗闇の底の底」 – Hohagi Aki 4: Dead Dead Love Alive 「デッドデッドオアアライブ」– Kimura Hidesato 5: The Man Who Died Twice「二度死んだ男」 – Kashio 6: The Last Human 「最後の人間」– Katoh Muw 7: The Two Of Us & Clear Weather「ふたりぼっち日和」 – Machino Suteinu 8: Zombie Cycle 「ゾンビサイクル」– Homerun Ken