Amagakure, Gido

Following the death of his beloved wife, high school teacher Kouhei Inuzuka tried to cook a meal for his five-year-old daughter Tsumugi despite his poor cooking abilities. But after one disastrous attempt, they began relying on food from convenience stores instead. While flower-viewing, Kouhei and Tsumugi run into Kotori Iida, one of Kouhei's socially awkward students. Once she spots Tsumugi trying to take a bite out of her lunch, Kotori invites them to her mother's restaurant.

In an attempt to feed Tsumugi something delicious, Kouhei barges into the restaurant in the middle of the night—only to find Kotori waiting for them and willing to help him in the kitchen. Although Kotori is as helpless as Kouhei when it comes to cooking, the two manage to make a simple dish. It turns out that, due to her mom's job, Kotori has been eating dinner alone for a long time. For the sake of Tsumugi's happiness, Kouhei promises her and Kotori that they will all eat together—thus marking the first of many sweet moments while sharing meals.

[Written by MAL Rewrite]

Amaama to Inazuma

Sweetness and Lightning

甘々と稲妻

Tsumura, Mami

Kotarou, a mysterious 4 year old, begins living in an apartment on his own. For some reason, he's perfectly capable of taking care of himself, despite the concerns of his neighbors.

Kotarou wa Hitorigurashi

コタローは1人暮らし

Nata, Kokone

With his parents going on a business trip, Shuuto Sakaguchi prepares himself to live in complete freedom for the following three months. However, upon returning home from school, he is greeted by a young girl he has never met before. As it turns out, she is Chiho Norita, the daughter of Shuuto's parents' colleague.

Without a say in this matter, Shuuto is suddenly entrusted with taking care of Chiho. However, he has no idea how to take care of children! Having to spend one hundred days together, Shuuto slowly develops a strong bond with Chiho as she becomes an integral part of his daily life.

[Written by MAL Rewrite]

Hyakunichikan!!

ひゃくにちかん!!

Azuma, Kiyohiko

While most people find the world mundane, five-year-old Yotsuba Koiwai sees it as a treasure trove of amazing bustle and wonderful places to explore. When she and her adoptive father, Yousuke, move to a new city, the energetic young girl naturally sets out to investigate the neighborhood on her own.

After a few incidents at the local park, the Koiwais become acquainted with their neighbors, the Ayase family. Their three daughters—mischievous college student Asagi, responsible high school student Fuuka, and kindhearted grade school student Ena—eventually all take a liking to Yotsuba and join in on her antics, despite their sheer ridicule.

From learning how to use a swing to figuring out how to stop global warming with air conditioners, Yotsuba's ability to infallibly find fun in everything, both amazes and annoys the people around her. Along with Yousuke, the Ayases, and friends she makes along the way, Yotsuba embarks on daily adventures, each one a step in her quest to enjoy the simple things in life.

[Written by MAL Rewrite]

Yotsuba to!

Yotsuba&!

よつばと!

Yoshino, Satsuki

Seishuu Handa is considered a prodigy in the calligraphy world. However, he is extremely narcissistic about his work, and when a senior curator dismisses his award-winning piece as conventional and bland, he loses his cool, leading to potentially career-ending repercussions. 

After seeing his son's immaturity, his father⁠—also a master calligrapher—sends Handa to a village in the Goto Islands as punishment. Deprived of city comforts, Handa moves into a house in the local village with the sole intention of spending his stay engrossed in calligraphy. However, the house he has moved into was previously the hideout for some rambunctious children, headed by Naru Kotoishi, who are unwilling to move out. Furthermore, the neighbors seem very interested in the calligrapher, who they see as an amusing oddity!

Despite Handa having been uprooted from his comfortable lifestyle, his experiences with the village and its people will teach him things about himself, life, and calligraphy.

[Written by MAL Rewrite]

Barakamon

ばらかもん

Tokeino, Hari

Ryuuichi Kashima has always taken care of his little brother Kotarou due to their parents traveling most of the time. After the Kashimas suddenly die in a plane crash, an elderly woman named Youko Morinomiya offers to become the brothers' guardian until they both become adults. It turns out that she lost her son and daughter-in-law in the same tragedy. The teenage Ryuuichi can also attend the school where Youko works as chairwoman, on one condition: he must be part of the "babysitting club," which serves as a place to look after the children of professors.
 
At first, it may seem like a rough start for Ryuuichi, but with the help of his classmate Hayato Kamitani and many others, he will experience novel adventures with the children in the club.

[Written by MAL Rewrite]

Gakuen Babysitters

学園ベビーシッターズ

Koike, Sadaji

After losing her mother to a traffic accident, five-year-old tomboy Michiru finds a "suspicious person" moving into her home: her father's younger brother Kouji, whom she quickly nicknames "Beard Gorilla." While awkward at first, it doesn't take long for them to develop a relationship that's closer to one between a brother and sister than an uncle and niece.

(Source: MU)

Chichi to Hige-Gorilla to Watashi

父とヒゲゴリラと私

Kumeta, Kouji

Every weekday, lively 10-year-old Hime Gotou watches her father put on his suit and tie before leaving for his nine-to-five office job. However, as soon as he loses sight of his innocent daughter, Kakushi Gotou runs to change from business attire into a washed-out T-shirt and old shorts.

As a single father, Gotou has one crucial secret he must absolutely keep hidden from Hime: his career as an established comedy manga artist. But the humor he is known for is excessively dirty and vulgar—meaning he will resort to anything in his power to prevent his unassuming daughter from ever reading it.

Compelled by his irrational fear that Hime will lose respect for him, Gotou employs Hime's teacher and his overworked editors as aides in his ridiculous attempts to keep her away from the truth. Even so, behind these absurd and silly situations, there are traces of a darker secret lurking in the past of the Gotou family.

[Written by MAL Rewrite]

Kakushigoto

Kakushigoto: My Dad's Secret Ambition

かくしごと

Aogiri, Natsu

Heisuke is a young man who was left in charge of taking care of his little cousin Aki for a day. Being an only child who usually stays at home alone, Aki is quiet, reserved, and will go out of his way not to make trouble for others. As they spend more time together, Aki begins to grow very attached to Heisuke, especially since Heisuke's hobby is to make sweets and desserts. The quiet Aki eventually opens up to Heisuke, and Heisuke in return teaches Aki that sometimes it's all right to be selfish and say what you really want to do.

(Source: Bliss Scanlations)

Included one-shot:
Volume 2: Fuyume (Winter Sprouts)

Flat

flat

Uchiko

Welcome to the bumpy, yet easygoing slice-of-life comedy of a certain father and son. The unpredictable and wild son, Shou. And the former gangster, hands-on father who looks out for him, You-san. Follow the lively father and son pair, as their everyday life is sure to eventful.

(Source: Crunchyroll)

Chichi to Ko

Father and Son

ちちとこ

Kodaka, Kazuma

This is a really cute, sweet story about two single dads Asakura and Kentarou, whose young sons happen to go to the same daycare.

(Source: MU)

Ikumen☆After

イクメン☆アフター

Ragawa, Marimo

Takuya is a normal Japanese elementary student whose mother died not very long ago, leaving him alone with his father and his baby brother Minoru. But his father is a busy man, and Takuya has to look after Minoru. Because of this responsibility that would normally never burden a child of his age, Takuya sometimes resents his fate and his baby brother... but his love for Minoru gives him the strength to carry on.

(Source: ANN)

Included one-shots:
Volume 2: Time Limit
Volume 4: Secret Boy ni Tee Dasuna!!
Volume 6: Baka de Karukute Wagamama de
Volume 15: Natsu to Kimi no Irradiation

12 Manga Like Otaku no Musume-san