From author's site:
I love math. Just after the high school entrance ceremony I meet a beautiful girl, Milka. Milka is a mathematical genius. She gives me many math problems and shows me many elegant solutions. Milka and I spend a long time discussing math in the school library.
A year later I meet another mathematical girl, Tetra. Tetra is one year younger than me, and asks me to teach her math. While I teach her, she begins to understand math and to love its elegance gradually."

The first series is about Fibonacci Numbers, Harmonic Numbers, Finite and Infinite Sums, Factorization, The Basel Problem, Partitions of the Integer, and Generating Functions.

N/A

The story of an orphanage, the children who live in it, and the beat-up old Nissan Sunny 1200 which provides them with a means of escape from their boring everyday lives.
In 2016 won the "Shogakukan Manga Awards" in the category "Best manga of the year".

In an era filled with war, Private Muol Reed is sentenced to death for murdering his superior and is labeled "Criminal No. 5722". While being led to his grave, a mysterious person decides to take him in...

Adapted from the light novel of the same name.

In the night train, Tadashi Hamazaki revives how he met his ex-girlfriend Mika Machida... in an extraordinary way.

The drifter gambling chef Hanjiro Daicho!! His cooking is unbelievably delicious!! He'll change this world's B class gourmet into first class!! The giant of the world of gourmet manga Shigeru Tsuchiyama brings a new delicious work to Japan's recession. Your life will take a turn! Eat it, the shockingly delicious Food Explosion!!

A manga set in the Steins;Gate universe told by the viewpoint of Makise Kurisu.

A girl struggles to save her farm of domesticated giant ants.

Shiina Atsushi, a Japanese-American boy, lives in Japan during WWII. He comes across a Chinese girl, collapsed among the debris of a collapsed building, with a strange glowing symbol on her back. She claims she's from another world that has been destroyed. As she attempts to leave, the military arrive and demand she go with them. Who is this mysterious girl? What will young Atsushi do?

Contains 12 chapters: 9 short stories, and 3 Miss China stories.

1. The Universe is so Vast and Wonderful!
2. Leaving One Night by the Light of the Full Moon
3. To Invoke the Stars
4. Little Melancholy
5. The Young Scientists' Club
6. See You Later, God Willing
7. Marsy in the Land of Time
8. Natsuko
9. The Young Scientist Club on Mars
10. The Melancholy of China
11. China's Wish
12. China Strikes Back

The Japanese edition collects all 12 chapters in one volume. The Spanish edition from Glénat released the full series in 3 volumes. The English edition from Dark Horse published only the Miss China chapters, first in comic format, then in one trade paperback.

All souls of those murdered arrive at the Gate of Grudges. Izuko, keeper of the Gate of Grudges, presents each soul with three choices: pass through the Gate of Grudges to heaven and be reborn, refuse to admit death and remain as a ghost on earth, or haunt and kill one person and then proceed to hell and eternal suffering. What does each soul choose and why?

Order of Sequels: Karma, Shinshou, "4", Hèven

The story follows the struggles of street gangs in a near-future version of Tokyo.

It is the fate of the Hirasaka family to protect a barrier underneath Tokyo that separates the human world from the demons of another world. One day, an incident in the underground tunnels claims the lives of 6 civilians and a Hirasaka. The mass death and the mysterious circumstances under which it occurred have been hushed up by some powerful, but unknown, people. These people seem to be dismantling the barrier the Hirasaka family has fought so hard to protect, and it is up to the remaining Hirasaka to stop them.

After Kaiji's showdown with Chairman Hyoudou at the Starside Hotel, he's forced into labour at an underground mine. With his meagre daily wage, he'll be working for decades to repay his debt unless he does something about his miserable situation.

Kaiji decides to wager his earnings in an underground dice game for a ticket to get out of the mine for a limited period of time. But even if he surfaces, he only has one chance to win it big: by challenging the unbeatable pachinko machine nicknamed "The Bog."

The 2nd part of the Kaiji series.

1. Tobaku Mokushiroku Kaiji

2. Tobaku Hakairoku Kaiji

3. Tobaku Datenroku Kaiji

4. Tobaku Datenroku Kaiji - Kazuya Hen

5. Tobaku Datenroku Kaiji - One Poker Hen

Shimatani Shousuke, an editor for a publishing company in Tokyo and Yamauchi Shinichirou, a graduate of one of Japan's top universities and bank employee, have been best friends all life long. After both of them proposed to the same girl, to keep their friendship intact, all three of them decide to get married.

Will this decision bring them closer together, or end up with one of them being left behind?

From A Duck's Paradise and Easy Going Scans:

Doppelgangers. Mice that take the form of humans. With murderous intent, the look-alikes and the originals are both pressured to fight in their own ways. After an ambiguous event in their life, Jin-Uk and So-Hee's love life has been shattered. While trying to reconcile with her, Ji-Suk meets her look-alike, and that's how this story starts. What will he do when he, too, has a look-alike destined to kill him? And what's the secret So-Hee will never tell?

World of Ramen has never been an easy path, but "Tenshukaku" sailed to the absolute top thanks to the unbeatable entrepreneur and cooking skill of Tatsuya Kamijo. However, after his sudden death, the wife and the four managers were left with a crisis, not knowing how to keep the monstrous legacy. Around the same time, Goro Sawada, the former salaryman, Mamoru Katsube, the son of a ramen shop, and a college drop-out Shinsuke Hyodo entered the drifting Tenshukaku to achieve their Master Ramen dream. But their ambitions were being hindered by corruption and foul play from within and outside the business... Will they persist the gallant path or will they finally surrender to the corrupted?

Lotus Girls' Academy. A school whose aim is to educate young girls to be pure and modest. Youko is a new transfer student here, and immediately takes a liking to Shuu, who shows her around the school. However, Youko discovers a big secret about Shuu... she's a vampire! Youko then does her best to be the best friend she can be and help Shuu protect her secret... whether Shuu likes it or not! But how does Shuu really feel about Youko... and why does her blood taste so different? And to what lengths will Youko go to help Shuu?