If you're looking for anime similar to Fastening Days, you might like these titles.
Fumiko, a timid school girl, shyly confesses her feelings for a boy named Takeshi. But rather than return the sentiments, he apologetically explains he needs to focus on baseball instead! Crying and embarrassed, Fumiko runs away down a hill – but she goes so fast, she can’t stop!
Both are short online releases with a similar art style. Both feature a somewhat frustrated and upset school girl and running/a chase down a hill takes up significant portion of the episode.
The premise of the story: "Snatch the rebel elements' secret data using the Surface! There is a leak saying that the giant coporation Ishimiya Industry will commit an act of international terrorism, and Motoko Kusanagi and the Armored Riot Police head out to seize the plug data!"
The short centers on a mysterious boy who fights creatures called "Unknowns" born from people's fear and uncertainty over what they don't know. He fights them with the help of an energy charger in his back, but runs out of energy at a critical moment. But remembering the kanji allows him to recharge and defeat the Unknowns.
The story is set in a town that preserves nature and its natural attractions using technology. It centers on a protagonist who has drifted apart from his childhood friend, and uses the FlatFormer to reconnect through time and space.
On a planet very similar to the earth… Here, the missile mechanoids started to have its own will and control, and were driving the human beings into serious danger. Shaleen was the last "ICHIRIN-SHA (unicyclist)" in the world, traveling the world on his beat up motor unicycle. One day, when Shaleen was running from the attacks of the missile mechanoids, he stops by a ghost town and meets a mysterious girl who was constantly targeted by the mechanoids.
College student Yui was suddenly invited by her mother to visit an observatory on her 20th birthday. Yui has to travel along snow-covered roads to reach the observatory. The visit makes Yui remember going to the same observatory with her late father on every birthday when she was a small child.