manga(s) that left me astonished

Chidori High, a bottom-feeder boys school where idiots gather, and Kikyo Girls School, a well-established girls school. Rintaro, a strong and quiet second year student at Chidori High, meets Kaoruko, a girl who comes as a customer while helping out at his family's cake shop. Rintaro feels comfortable spending time with Kaoruko, but she is a student at Kikyo Girls, a neighboring school that thoroughly dislikes Chidori High. This is the story of two people who are so close and yet so far apart.

"Ethics" is the path of humanity, a principle that becomes the norm of morality. Learning is not a problem in the future. But this class is filled with the truth of life. Cool ethics teachers and Takayanagi confront the problems of students and their own stance.

The stage ; a city where "witches" collect people's worship. Who appeared there was a man carrying a coffin, and a girl with a beast's eyes. Their prey, "Witches"! And nothing else. When the evil "witch" and the starved "beast" meet, their magnificent and fierce battle begins!

In the Lapland region of Finland, the domain of snow, midnight sun, and auroras, there is the small Hotel Metsäpeura, run by 2 older gentlemen. One night during a terrible blizzard, a mysterious young man named Jun arrives at the hotel. He is clearly in dire straits, with a large tattoo on his back, no relatives and no money. However, the gentlemen warmly welcome him in and offer him a job at the hotel. The kindness of the people living in the harshness of nature will melt the heart of this man

In order to clear the name of 'Emi,' a girl who had reincarnated as Remilia, the villainess of an otome game, the real Remilia who had been watching all along inside awakens.
Now it's time for the true villainess' revenge to begin!

"You've escaped from all your suffering, so I'll make sure you know happiness for the rest of your life." Shiroshika Muku's childhood ended ten years ago when her father died, her best friend moved to Tokyo, and she, together with her mom and little sister, had to go to live with her grandparents. Trying to fulfill the role her father left behind, Muku, a now 21-year-old woman, feels like drowning.

In a deserted post-apocalyptic metropolis riddled with a mysterious material a young girl is searching for any signs of life and supplies.

A high school student, Haro Ogawa, is a self-taught oil painter who is trying to paint the ultimate nude. After an encounter with a "witch," he sets his sights on applying to art school. The mystery that resides in the human body, the ultimate "beauty" is painted on canvas! A skin-colored coming-of-age drama.

William is the lone human in a city of the dead. Born with vague memories of a past life and raised by a group of undead, William must discover what circumstances brought him to this city and these people as well as what it means to not just exist, but to live a full life.