If you're looking for anime similar to Gyakusatsu Happy End, you might like these titles.
New kid Keiichi Maebara is settling into his new home of peaceful Hinamizawa village. Making quick friends with the girls from his school, he's arrived in time for the big festival of the year. But something about this isolated town seems "off," and his feelings of dread continue to grow. With a gnawing fear that he's right, what dark secrets could this small community be hiding?
Maebara Keiichi, an ordinary high-school boy, has transferred to a new school in Hinamizawa, a small rural village. At the outset everything seems peaceful and Keiichi becomes friends with a nice group of schoolgirls with whom he spends many idle summer afternoons. Suddenly violence encroaches upon the blissful peace of the village and Keiichi becomes entangled in an endless cycle of fear and death. The inconsistent, but inevitable horrors of Hinamizawa are told and retold becoming an endless and inescapable nightmare of insanity. Will it end even if the mystery of Hinamizawa is solved?
It is the year 1983; and in the village of Hinamizawa, on the night of the cotton drifting festival and in the days following it, a series of deaths occurs. The only hope for the village and its inhabitants is the shrine maiden Furude Rika who, with the help of her invisible partner Hanyuu, is able to travel back in time and alter the events that led to disaster. Unfortunately, regardless of what changes are made, each voyage ultimately ends with the death of Rika and many of her friends. But when Rika’s friends start remembering things that happened to them in previous worlds and take steps to avoid the same outcomes, Rika realizes that their chances of survival have never been better. Can she really challenge and defeat fate itself?
On a solemn night in July 1998, teenager Fujino Asagami is mercilessly raped by a street gang in a dilapidated bar. No matter what physical or sexual abuse they deal, however, the girl regards her captors with the same apathetic expression. The next day, mangled bodies are discovered in that same building, so torn apart that investigators find it infeasible to even consider the culprit human...
Rin is a private investigator with an advantage: near immortality. Thanks to the spores of the Yggdrasill tree, both she and her assistant Mimi have lived many years longer than the average person. That isn’t to say that being immortal doesn't have its problems. With 'angels' wanting to devour them, the being Apos sending wave after wave of professional assassins to kill them, and constant hangovers from long nights of drinking, being immortal still has its downsides. With Apos' attempts at removing them from the picture increasing, can Rin and Mimi figure out what he is after so they can return to their morning shots of Vodka?
The eccentric mad scientist Okabe, his childhood friend Mayuri, and the otaku hacker Daru have banded together to form the Future Gadget Research Laboratory, and spend their days in a ramshackle laboratory hanging out and occasionally attempting to invent incredible, yet generally useless, futuristic gadgets. However, their claymore is a hydrator and their hair dryer flips breakers, and the only invention that’s even remotely interesting is their Phone Microwave, which transforms bananas into oozing green gel. But when an experiment goes awry the gang discovers that the Phone Microwave can also send text messages to the past. And what's more, the words they send can affect the flow of time and have unforeseen, far-reaching consequences...
In November 1998, a double homicide occurs at the newly constructed Ogawa apartment complex. Shiki meets a boy named Tomoe Enjou, a runaway who claims to be the murderer, and lets him use her apartment as his hideout. From that day onward, their strange cohabitation begins. Coincidentally, Mikiya Kokutou is investigating a tip regarding the murder at that unique apartment complex...
When popular pop idol Mima decided to retire from her group, Cham, and become an actress, she had no idea that one person's obsession would soon spiral out of control. With death threats, letter bombs and a forged website which details her every move, Mima finds herself slowly becoming trapped in a nightmare she can't seem to escape. With murders piling up and her mental state slowly degrading, can she discover who the culprit is, before she becomes the next victim?
Encased by trees that are used to make grave markers, Sotoba is a village thought to be surrounded by death - a fact that soon literally becomes the case. One summer, a series of mysterious and untimely fatalities begins to plague the small rural town. With a higher than normal mortality rate for the time of year and each cause of passing remaining unknown, Toshio, the local doctor, and Seishin the temple’s vice chief monk become suspicious and take it upon themselves to investigate. However, as the deaths begin to pile up, more people begin to wonder just what is behind this sudden epidemic; could it have anything to do with the bizarre Kirishiki family that recently moved to the village?