Same-themed manga about kid fighting female ninjas from japanese imageboard.
(COMIC1☆13) [Marble Kid (Tsubaki Metasu)] Zenbu Lily ga Warui (Fate/Grand Order)
Swim Brief Boy
[John Sitch-Oh] Swimming Club Capriccio (COMIC Megastore 2011-03) [English]
Kinjo no Jimi na JC ni Otona no Asobi o Oshiete mita Hanashi
(C88) [Samidaregiri (Crowly)] SOLAR SONG Dance to Another Tune 2 (Kid Icarus, Metroid) [Chinese] [黑白灰汉化组]
(C87) [Samidaregiri (Crowly)] Dance to Another Tune 2 - Solar Song (Kid Icarus, Metroid) [English] {doujin-moe.us}
(COMIC1☆3) [DIRTY (Yosuke)] ZETSURIN ANGEL (Various) [English] [N04h]
[Minatoya Shunsaku] Nagai Kiss de Kuchi o Fusaide | Sealing your mouth with a long kiss (Himitsu no Roshutsu Kids) [English] [WiD]
Rokurokku Roll
Jimi na Hitorimusume ga Tsuma no Kawari ni SeFri ni Natte kureta Hanashi
(C94) [Kuroneko Tenugui (Tsukai)] ICHA LOVE ZEKAMASHI (Kantai Collection -KanColle-)
[Pinky☆Crown (Nanahoshi Suama)] Tenshi no Oshigoto (Kid Icarus) [English] {Shotachan}
(Zenkai Cadence 3) [SwimS (Komano Mako)] Anata no mono ni Naretanara (Yowamushi Pedal)
(C84) [Circle Ohigetan (Ohigetan)] Ohigebon-43 Suieibu! | Swimming Club! [English] [HappyMerchants]
(C88) [H-SQUAD (Guglielmo)] Zenra de Suiei no Jugyou!! | Naked Swimming Class!! [English] =LWB=
Kemomimi no Senjutsushi
Hamezukids Ch. 1-4
(C93) [Tekokids (Leonardo 16sei)] Gomen ne Yuusha-sama (Mahoujin Guru Guru)
(C46) [R-KIDS (Various)] R KIDS! Vol. 8 (Various)
(C87) [Samidaregiri (Crowly)] Dance to Another Tune (Kid Icarus, Metroid) [English] {doujin-moe.us}
[Tonda Moko] Boku no Kawaii Dohtei-kun | 我可爱的童贞君 Ch. 1-6 [Chinese] [拾荒者汉化组] [Digital]
Kodomo janai | I'm not a kid anymore!
(C92) [vyowolf (vyo)] NiizuMakabe (THE IDOLM@STER MILLION LIVE!) [English] [Cool Kids Translations]
(CR31) [Studio Wallaby (Deep Purple '72)] Su no Naisho!! -The secret of Su- (Vampiyan Kids)
[MAKE3D] Married Slut - Sex Assaults Welcomed! Perv Wife's Swimming Club
[Zaki Zaraki] Hamezukids
Gaki ni Modotte Yarinaoshi!!! | Turning Back Into a Kid And Starting Over!!! Ch. 1
(C80) [DA HOOTCH (ShindoL)] DRAGON CHILD (TIGER & BUNNY) [English] =LWB=
[Tekokids (Leonardo 16sei)] Saimin Watch (Youkai Watch) [Digital]
[Neyukidou (Takaku Nozomu)] Kids Return [Digital]
[Fred Kelly] Ingyaku Kemono Youentai Magyou ~Fighting Kids 2~
NIN NIN SLAYER ~Kids Ninja Shouten~
[Konsu Konsuke] Asuka 120% -Burning Fest- (Neon Genesis Evangelion) [Chinese]
[ASTRA]ASTRA'S ARCHIVE #04
big kid!
(C80) [Parupunte (Fukada Takushi)] Swimming Suit
Pavlov, The Swimming Club, and the End of Summer
Girl Athlete - Misery Training ~Swimming~
[milkids (Potekoro)] Doremiho (Ojamajo Doremi)
(COMITIA116) [Tekokids (Leonardo 16sei)] Girls A
T-KIDS
[Yoshitakashi Athletic (Yasaka)] Chrono Kid TSURUGI: Operation Tights
Harassment? Love?
(C48) [R-KIDS (Various)] R KIDS! Vol. 10 (Various)
Homare no Himegimi
Kodomo Datte H Nano | They're just kids but they're sluts
(C88) [Samidaregiri (Crowly)] SOLAR SONG Dance to Another Tune 2 (Kid Icarus, Metroid)
Swim x Strong x Love
Yukari 3
Enjo Kouhai Swimming Costume
Swimming Life Ch. 2
Swim Sweet Standard
(CSP6) [Samidaregiri (Crowly)] Palutena-sama to Fushigi no Anano Shota (Kid Icarus)
Nyotaika Suieibu ~Ikutabi Onna ni Nacchau Ore no Karada~ | Nyotaika Swim Club - I Turn into a Girl When I Cum!
[Oyster] Watashi Kirei? Ch. 3 [English] =LWB=
[Hidemaru] Ryoujyoku!! Urechichi Paradise Ch. 6 | Become a Kid and Have Sex All the Time! Part 6 [English] {Doujins.com}
PARADE
[milkids] Doremilk (Ojamajo DoReMi)
[Nyanko Batake] (Murasaki Nyaa) Swim Brief Boy [English]
[Noise] Kodomo no Ecchi wa Manual Doori ni | Sex Manual for Kids (COMIC LO 2017-01) [English] [worldendDominator]
[Himuro Serika] Nyotaika Suieibu ~Ikutabi Onna ni Nacchau Ore no Karada~ 2 | Nyotaika Swim Club ~I Turn into a Girl When I Cum!~ 2 [English] [gender.tf]
[FRED-KELLY] Fighting Kids
(Shota Scratch 17) [EGO DANCE (Nanamatsu Kenji)] Ultra C (Various)
Naruco Hanaru Works7 - Erotic Kid Erotic Chair
[Kamoro-Sa-Z (Oobanburumai, Migiyori)] DRAGON & ROSE (TIGER & BUNNY) [Digital]
[Ariga Tou] Onaho Viber
(C88) [Tekokids (Leonardo 16sei)] Tsuyu Biyori (My Hero Academia) [Chinese] [沒有漢化]
Otona no Cookie
KidsReturn
Suieibu no Seisokei Osananajimi ga DQN ni Moteasobareru Ichibushijuu | The Whole Story of My Neat Childhood Friend in the Swimming Club Being Toyed With by a Dumbass
[90C] Camical Candy Show Case (Soul Eater) [English] {Kusanyagi}
Suieibu Capriccio | Swimming Club Capriccio Ch. 1-7
(C91) [Futaba (Chihiro)] Billy-kun ga Master ni Fudeoroshi Shi Sasete Ageru Hon (Fate/Grand Order)
Motomoto, Jimiko datta Ore no Gal Kanojo ga, Yarichin ni NTR
[Tekokids (Leonardo 16sei)] Tsuyu Biyori ~Katei Kyoushi no Oshigoto~ (Boku no Hero Academia) [English] {doujins.com} [Digital]
[Emua] Ryouran Gakuen Kakumeiki - Hyakka Ryouran! [English] [biribiri]
[Kirigakure Takaya] Immoral Kids
(COMITIA116) [Tekokids (Leonardo 16sei)] Girls A [English] [Heart and Feather] [Sample]
[Zaki Zaraki] Yuuwaku | Temptation (Hamezukids) [English] {Mistvern}
[Neyukidou (Takaku Nozomu)] Kid's Return [English] [Digital]
Gaki ni Modotte Yarinaoshi!!! | Turning Back Into a Kid And Starting Over!!! Ch. 1-5
Dance to Another Tune
Love is Forbidden!! Swimming Club
[Himuro Serika] Nyotaika Suieibu ~Iku tabi Onna ni Nacchau Ore no Karada~ 3 | Nyotaika Swim Club I Turn into a Girl When I Cum! 3 [English]
(Anata to Love Live! 5) [Ringoya (Alp)] Love Swimming Bell (Love Live!)
[K.Z.Z. gundan (K.Z.Z.)] Nekketsu Kid (Mahou Sensei Negima!)
(Reitaisai 14) [Tekokids (Various)] Otona no Cookie ~Asoteddo~ (Touhou Project)
[Hidemaru] Ryoujyoku!! Urechichi Paradise Ch. 6 | Become a Kid and Have Sex All the Time! Part 6 [English] {Doujins.com} New
Swimming Club Capriccio CH. 6
[Hidemaru] Ryoujyoku!! Urechichi Paradise Ch. 6-7 | Become a Kid and Have Sex All the Time! Part 6-7 [English] {Doujins.com}
(Ikezu na Anatasama Okawari) [Sweet Avenue (Kaduchi)] Swim Sweet Standard (THE iDOLM@STER)
将妳的一切全部拥入怀中~交往0日、立刻结婚!?~ 01-24 Chinese [拾荒者汉化组]
[NIKKA, Kokuritsu Shounen (Mario Kaneda, Imamura Youko)] National Kid 7 (Seiken Densetsu 3)
Damasare Kids
Naka Mutsumajiku | Love Among Family
Swim Suit Sister [English] [Rewrite] [EZ Rewriter]
-swimming classroom
Yume demo Genjitsu demo Nai Waraibanashi | A Funny Story That is Neither a Dream nor Reality
(C88) [H-SQUAD (Guglielmo)] Zenra de Suiei no Jugyou!! | Naked Swimming Class!! [English] =LWB= [Colorized] [Decensored]
(C84) [SwimS (Komano Mako)] Swimmer in the Dark (Kuroko no Basuke)
Let's try not to kill each other, okay..?
[R-KIDS] Ai wa Kagerou
[John Sitch-Oh] Suieibu Capriccio | Swimming Club Capriccio Ch. 1-6 [English] [Lazarus H]
COMIC Penguin Club 1991-11
[Zaki Zaraki] Giji Taiken | Indecent Kid Experience Ch. 1-8 [English] {Mistvern}
[MEKONGDELTA & DELTAFORCE] Route Map SSSS (School Swim Suit Special)
Billy-kun ga Master o Nagusamete Ageru? Hon
(C94) [Tekokids (Leonard 16sei)] Enkou Rock 'n' Roll Fever (Hinamatsuri)
[Shinama] Kyouei! | Shameless Swimming Club [English] {doujin-moe}
[Seito A] Oyogeru You ni Naritai na - I want to be able to swim. Ch. 1-2 [Digital]
Naughty! Kids Time
(C77) [Rabbit Labyrinth (Namikaze Rankuu)] RABI×2 3rd Ch. 1 (Soul Eater) [English]
(IDOL STAR FESTIV@L 02) [Little Bear (Koguma no Joey)] Otona no Junban (THE IDOLM@STER MILLION LIVE!) [English] [Cool Kids Translations X Cozy Translations]
Billy The Kid: Kegareta Eiyuu
(Anata to Love Live! 5) [Ringoya (Alp)] Love Swimming Bell (Love Live!) [Chinese] [佳奈助汉化组]
Natsuyasumi Kids wa Kozukuri Kenkyuuchuu
(CSP6) [Samidaregiri (Crowly)] Palutena-sama to Fushigi no Anano Shota (Kid Icarus) [Chinese] [黑白灰汉化组]
[Ariga Tou] Hip Swimming Ch. 2 (COMIC Mugen Tensei 2017-07) [Chinese] [鬼畜王汉化组] [Digital]
[Chuushin Kuranosuke] Like a KIDDING! Ch.1 - Identical Twins [English] [Uncensored]
(C89) [Hokkebain! (Halcon)] Itoshi no Kyouei Mizugi Instructor Senkan Nagato | Fascinating Swimming Instructor, Battleship Nagato (Kantai Collection -KanColle-) [English] =CaunhTL=