If you're looking for manga similar to Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai. (Novel), you might like these titles.
On the day before summer vacation, every boy in a first-year class of a downtown Tokyo middle school disappears. Was it some accident? A mass kidnapping? Actually, the boys holed themselves up in an abandoned factory on the riverbed. With support from the schoolgirls, the boys start a revolution against the adults from this "liberation zone."
A face-less female ghost wearing a mini-skirt is known to roam around at night in this city. Kalin Nanase is the ghost of a celebrity who died an unnatural death. A detective named Saki Yumihara encounters the ghost of Kalin and is saved by a girl named Kotoko Iwanaga. Kotoko was kidnapped by ghosts when she was a little girl and has ever since served as a mediator between people and ghosts. Kotoko also happened to be dating Saki’s ex-boyfriend Kurou Sakuragawa. Kotoko and Saki work together to solve Kalin’s case.
There’s an urban legend that claims the ghost of a young woman will appear if you set off fireworks in a certain abandoned airport. Three high school students are united by their shared desire to meet this ghost–and each of them is close to death. What happens when they come together one fateful summer night as the boundary between life and death grows thin?
DO YOU HAVE THE STRENGTH TO FACE WHAT LIES BEYOND? Seventeen-year-old Suzume lives with her aunt in a quiet port town in Kyushu. One day, on her way to school, she runs into a young man searching for something and follows him to a ruin in the hills. But inside, all she finds is a single white door among the rubble. As if pulled by an invisible force, she reaches out to open it...and begins an epic journey across Japan connecting the past, present, and future.
The story is set in Tokyo, after bubbles that broke the laws of gravity rained down upon the world. Cut off from the outside world, Tokyo has become a playground for a group of young people who have lost their families, acting as a battlefield for parkour team battles as they leap from building to building. Hibiki, a young ace known for his dangerous play style, makes a reckless move one day and plummets into the gravity-bending sea. His life is saved by Uta, a girl with mysterious powers. The pair then hear a unique sound audible only to them. Why did Uta appear before Hibiki? Their encounter leads to a revelation that will change the world.