Same-themed manga about kid fighting female ninjas from japanese imageboard.

Kodomo Janaishi! | I'm Not a Little Kid!

[Hochidonmai (Donburako)] Kids Know-It-All-Know-It-All-Know-Who-Go-Na-Na-Kid-Stream ★ ★

(C99) [sagejoh (sage joh)] Mou Kodomo ja nain da yo? | I'm Not a Kid Anymore, You Know? [English] [Nisor]

[Yakisoba Pants (Hiiragi Popura, Grand Deer)] Yanmama o Gaki no Sugata ni Natte Fukushuu NTR | Revenge NTR of a Yanmama in the Form of a Kid [English] {Doujins.com}

Older woman & kid body swap

(C84) [Karasuma Pink Higashiiru (Karasuma Pink)] Niwa ni wa 2-wa Niwatori ga Iru (Kid Icarus) [English] [Yuuta's Blog]

(C90) [Karasuma Pink Higashiiru (Karasuma Pink)] Delivery Angel Land (Kid Icarus) [English] {TheRobotsGhost}

(ShotaFes 3) [Pometeor (Enotou)] Shinyakuseisho (Kid Icarus: Uprising)

[Team Kid (k-ya)] Gotoubun no Hajimete (Gotoubun no Hanayome) [Digital]

(C94) [Small Marron (Asakura Kukuri)] FDO Fate/Dosukebe Order VOL.0 (Fate/Grand Order) [Chinese] [靴下汉化组]

(Reitaisai 13) [Perceptron (Asaga Aoi)] Fight Saikyou Tennin VS Zako Youkai | Fight! Strongest Celestial VS Small Fry Youkai (Touhou Project) [English] [robypoo]

(Reitaisai 13) [Perceptron (Asaga Aoi)] Fight Saikyou Tennin VS Zako Youkai | Fight! Strongest Celestial VS Small Fry Youkai (Touhou Project) [English] [robypoo]

[Small Marron (Asakura Kukuri)] Junai Collection Gokousen (Kantai Collection -KanColle-) [Digital]

[Streich (Kano Ryoki)] a smoky small fry [Chinese] [黑夜汉化组]

(COMIC1☆11) [Small Marron (Asakura Kukuri)] FDO Fate/Dosukebe Order (Fate/Grand Order) [Chinese] [瓜皮汉化]

(HaruCC22) [Optimism small country (Haruto)] Shino wa Wakatte Kurenai (Mobile Suit Gundam Tekketsu no Orphans)

[Optimism small country (Horikiri Haruto)] Jirettaikedo Ore ni Motto Te o Dashite Hoshii Nante Ienaidaro Daichi no Baka! (Haikyuu!!)

(HaruCC21) [Hailar, Small Clone (Sake, Kayato Sae)] Koibito ga Neko ni Narimashite (Owari no Seraph)

[Daifuku Keiji] Small Package

(RTS!!5) [Optimism small country (Horikiri Haruto)] Mousou Kisei Jijitsu (Haikyuu!!)

[Shiruka Bakaudon] JC★Bokobokorin! ~Beating Up the Small Penis Chapter~ [English]

(C89) [Optimism small country (Horikiri Haruto)] Sutabaa no Ura Menu (Osomatsu-san) [English] [Rapinii]

(Shuumatsu no Yogen) [Small Clone (Kaya to Sae)] Ichinose Kachou no Koibito (Owari no Seraph)

[Fuyuno Mikan] Chiisakutemo iijanai! | What's wrong with being small!? [English] [Rin]

(Kagaku Seiki no Cafe Terrace 5) [02 (Harasaki)] Komakasugite Tsutawaranai Sumireko-chan no Shiin | Too Small To Convey: Causes of Sumireko-chan's Deaths (Touhou Project) [English]

[Nakamuratakumi (kemukemuke)] Chiisana Senpai to Ookina Kouhai | Small Senpai and Big Kouhai [English] [CDG Scans] [Digital]

[Sugi G] Chiisana Heya no Irony - Irony of the Small Room (COMIC HOTMiLK 2014-11) [Chinese] [大爆射漢化姐]

[Sugi G] Chiisana Heya no Irony - Irony of the Small Room (COMIC HOTMiLK 2014-11) [English] [brolen]

[Small Gift] Date A Live H illustrations collection(Date A Live)

[Ashimoto☆Yoika] Tekubi ni Honno, Sukoshi Dake | Just a Small Tad on the Wrists (COMIC Anthurium 016 2014-08) [English] [Facedesk]

[Wasukoro (Sakaki)] Sasayakina Hangeki | A Small Counterattack (Free!) [English] [Moy Moe Scans]

(COMIC1☆8) [momoirohoppe (Rei)] Small Lady no Oose no Mama ni (Bishoujo Senshi Sailor Moon)

(C86) [Renai Mangaka (Naruse Hirofumi)] Shitsumushitsu de no Chiisana Vacances | Small Vacation in the Office (Kantai Collection -KanColle-) [English] {doujin-moe.us}

(SC62) [GUST (Harukaze Soyogu)] Second Osananajimi wa Hinnyuu ☆ Binkan! 2 nd! ! | The Second Childhood Friend Has Small, Sensitive Breasts! (Infinite Stratos) [English] [RapidSwitch]