SIDE COUPLE APPRECIATION - BL SPINOFFS

1. Kashima x Ryouji
original: Simplified Pervert Romance

2. Sho (Kashima's friend) x Nao
spinoff: http://www.mangago.me/read-manga/rational_pervert_romance/

1. Manabu x Takefumi
original: http://www.mangago.me/read-manga/seinen_hakkaten/
sequel: http://www.mangago.me/read-manga/aoi_tori_yori/

2. Koga (Manabu's uncle) x Najima
spinoff: Yakedo to Tsumeato

1. Takimoto x Sakuma
original: Makkurayami De Kimi To

2. Bruno x Iwase (Sakuma's twin brother)
spinoff: http://www.mangago.me/read-manga/code/

1. Akiha x Yukuri
original: Yakimochi wa Kitsuneiro

2. Hayato (main couple's friend) x Kaneki
spinoff: http://www.mangago.me/read-manga/aimai_na_wolf/

1. Shindo x Komatsu
original: https://www.mangago.me/read-manga/koi_ni_nare/

2. Ryuusei x Nakajima (Komatsu's roomate)
spinoff: Koi Nanka Shitakunai

1. Michiru x Shiou (original)
2. Natsume (Michiru's school nurse) x Kakone (spinoff 1)
3. Yukio x Takana (Kagetora's coworkers) (spinoff 2)
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4. Shingo x Keichi (Michiru's actor colleague) (spinoff 3)
5. Jin (Keichi's older brother) x Eli (spinoff of 4)
6. Rio (Jin's son) x Ritsu (spinoff of 4)

list of all stories in order
https://www.mangago.me/home/mangalist/39827/?filter=&page=1

1. Shingo x Ao
original: Cupid ni Rakurai

2. Takeo x Wakou
spinoff: https://www.mangago.me/read-manga/kanshaku_dama_no_love_song/

1. Hajime x Masaki
original: https://www.mangago.me/read-manga/pinup_boy/

2. Shouta x Hiroto (customers of Yoshio "Mama"'s bar)
spinoff: Otoshiana ni Hamerarete

3. Yoshio (Masaki's Uncle; Hajime's employer) x Tenma (introduced Hajime to Yoshio)
spinoff2: https://www.mangago.me/read-manga/yoru_mo_hi_mo_akenai/
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Mayonaka Love Alliance - Continued story of couple 1 and 2
sidestory: https://www.mangago.me/read-manga/mayonaka_love_alliance/

1. Yumi x Mayama
prequel: https://www.mangago.me/read-manga/azami/
original: https://www.mangago.me/read-manga/sabita_yoru_demo_koi_wa_sasayaku/

2. Kan (Yumi's ex bf) x Shuuna
spinoff: Renai - rubi no Tadashii Furikata - ch 4-5;6
sequel: https://www.mangago.me/read-manga/hadakeru_kaibutsu/

1. Taka x Kiwamui
original: https://www.mangago.me/read-manga/self_portrait/

2. Naoto (Taka's younger brother) x Iori
spinoff: https://www.mangago.me/read-manga/april_4/

3. Ayumu (Taka's best friend) x Sawatari
spinoff2: Interval
sequel:https://www.mangago.me/read-manga/interval_dj_garakuta_zoukangou_gougai/