Adachi, Mitsuru

Touch is a shounen story about two twin brothers, a pretty girl next door, and that good old pastime of baseball. The manga was written by one of the most well known manga-ka out there, Adachi Mitsuru in the early 80's (1981-1986). He's a wonderful writer who tends to write stories that are related to baseball and Koshien, the stadium where the All High School Baseball Tournament is held.

(Source: MangaProject)

Touch

タッチ

Yamato Keisuke, a promising freestyle swimmer, and Ninomiya Ami, a talented diver, are the offspring of two rival families owners of confectionery shops. Two generations ago, Grandfather Ninomiya came up with an idea for an owl-shaped cake, but Grandfather Yamato quickly raised to the challenge and thought of a similar cake—but in Yamato's the owl had ears. Because they're priced the same, Yamato's extra ears were crucial, and that made the business of the Ninomiya confectionery suffered. Grandfather Ninomiya then fell ill worrying about his shop. Before his death, his last words were "I was killed by the Yamatos," and since that moment the two families have been sworn rivals. 

(Source: MU)

Rough

ラフ

Aoyama, Goushou

Kaito Kuroba, a normal teenage student whose father is often absent. When his father dies under mysterious circumstances, he is made aware of his father's secret identity; a famous international criminal known as International Criminal 1412: the Phantom Thief, and that he was murdered by a mysterious organization for refusing to aid them in retrieving the "Pandora Gem"; a mystical stone said to shed a "tear" during the passing of a particular comet (often called the 'Volley Comet'), the consumption of which bestows immortality. He vows to prevent the organization from gaining immortality, and assumes his father's identity as he begins his quest for the gem. His only clues as to the gem's location are that it glows red under the full moon and that it is a doublet: a gem hidden within a larger gem. Thus, it would have to be a relatively large one with a bizarre history, and always stored in a place that never receives moonlight. He thus researches and steals famous priceless gems with odd histories from incredibly well-defended areas, and always returns them after the very next full moon.

(Source: Wikipedia)

Magic Kaito

まじっく快斗

Takahashi, Rumiko

What would you do if a tiger skin bikini-clad alien followed you to school every day? Poor Ataru's life has never returned to normal since volatile extraterrestrial princess Lum fell for him. Now an excruciatingly wealthy and genteel rival, Mendo, adds to Ataru's torment. Not to mention an unending stream of extraordinary classroom visitors and educational materials including incompetent cherry blossom spirits, a legendary nightmare-eating tapir, and a fourth-dimensional camera that breaches alternate realities.  

(Source: VIZ Media)

Urusei Yatsura

Lum*Urusei Yatsura

うる星やつら

Hojo, Tsukasa

The protagonists of the series are the three Kisugi sisters—Hitomi, Rui and Ai—who run a café called Cat's Eye. The sisters lead a double life as a trio of highly skilled art thieves, leaving cards with the name "Cat's Eye" at the scene of their crimes. They steal works of art (mostly paintings) that belonged to their long-missing father, Heinz (who was a famous art collector during the Nazi regime), in the hopes of him contacting them. Toshio, the police officer investigating this case is the fiancé of Hitomi. He also swears to capture and bring down the Cat's Eye Gang.

Cat's Eye

キャッツ・アイ

Wakamatsu Masato lives with his step-sister, Miyuki, whom he does not have blood relationship with. Their father is always working overseas and left the two of them living by themselves in Tokyo. Miyuki is cute, nice, sensitive and very popular among guys around Masato. Masato has a girlfriend at school whose name is Kajima Miyuki, who is pretty and gentle, the ideal dream of every high school boy. It took years for Masato and his sister to realize whom they love and care the most.

(Source: The Ultimate Manga Guide)

Miyuki

みゆき

Right before track star Katsuya Nimi and judo champion Susumu Karasawa enter high school, they see a pretty girl crying as the school's baseball team looses yet another game. It turns out that she's Yuri Nakao, the baseball coach's beautiful daughter, who is worried because the team is in danger of closing down if the streak continues. Katsuya and Susumu decide to join the baseball team in hopes of helping them make it to Koshien. Things get more complicated, however, when Katsuya starts to fall for Yuri... but their budding romance is interrupted by a few potential rivals. Can Katsuya learn both how to win at baseball and at romance?

Included one-shots:
Volume 5: Koibito Sengen, Zoku Isourou yori Hitokoto

Nine

ナイン

Hosono, Fujihiko

Nikumaru, meaning "meatball" in Japanese, is a seventeen-year-old student at Ninja High School, a special school for the training of ninja. He is short and chubby, but he possesses a super technique known as the "kamikaze", where he stirs up a whirlwind with his feet. The series introduces his many adventures and pranks as Nikumaru meets with his rivals both in and out of school.

(Source: Animeinfo)

Sasuga no Sarutobi

さすがの猿飛

Eguchi, Hisashi

A teenage boy has now moved in the home of his mother's friend, because she had died a while back. It just so happens that the Yakuza family has four beautiful daughters, but one daughter, Hibari, who is more beautiful then the rest of the daughters, is actually a boy. Hibari just can't keep his hands off our hero and so their crazy yet happy lives go on.

(Source: ANN)

Stop!! Hibari-kun!

ストップ!! ひばりくん!

Emoto, Tomoru

Shingo Akashi, a high school boy, falls in love at first sight with a girl waiting at a crosswalk! Will the goddess of love smile upon him as he does everything he can to win her over?!

(Source: MANGA Plus)

Majime-chan to Akashingou

Miss Serious and the Red Light

まじめちゃんと赤信号

Mizutani, Naoki

The basic story: a high school student (Nanase Hokuto) living away from his parents (who are in Australia) shares an apartment house with three older girls. His exposure to their whimsical and teasing nature leaves him pretty much despising females. However, the high-school idol (Taniyama Maina) ends up having a crush on him. Her best friend is Nakajima Atsumi, your typical sukeban. Hokuto's best friend, Moriyama Syuuichirou, is the young-punk biker. These two friends conspire to hook Hokuto up with Maina, much to Maina's delight and Hokuto's chagrin. Into this setting we interject the jealousy of the rest of the high school, a female rival for Hokuto's attention, a number of fights, the inevitable parents recalling Hokuto, and Maina threatening to run away from home. We could go on, but pretty much everything is in here.

(Source: ex.org)

Jinrui Nekoka

人類ネコ科

Fukumoto, Nobuyuki

This is the story of Mr. Adachi, an unconventional homeroom teacher, and his tribulations after meeting his new student teacher, Miss Asuka Shirayuri.

(Source: MangaDex)

12 Manga Like Seihantai na Kimi to Boku