Subarashiki Hibi ~Furenzoku Sonzai~ or Wonderful Everyday: Discontinuous Existence is a 2010 visual novel developed by Sca-Di and released by KeroQ. It's a rewrite of the denpa classic Tsui No Sora, released by the same developer in 1999.
The story is one of the only denpa to be translated to English- Denpa being a hard-to-define genre of visual novel that tends to follow themes of delusion and disconnection from reality. It's a long work, spanning fifty hours of playtime and eight chapters, including an epilogue. While it does have different endings, there's not many choices unlike typical visual novels, and you have to reach the "true end" of each chapter in order to progress.
Plot Subarashiki Hibi follows the story of the students of Kita High as one of the students, Takashima Zakuro, commits suicide and conspiracies of the end of the world begin to arise, with Mamiya Takuji at the heart of them. Beginning with the perspective of Minakami Yuki as she attempts to uncover the truth of the cult started by Mamiya Takuji, each chapter follows a different perspective, recounting the events leading up to the "end sky" of July 20th.
My Opinion Honestly subahibi is literally one of my favorite visual novels of all time even though i didnt finish it... i only got to the second last chapter LOL anyway it's such a heavy read and one i wouldn't reccomend honestly to everyone although i usually reccomend it to people jokingly. it's really hard to understand past what you're given however the deeper meaning of the story is suuuper interesting!!! don't look past it just because it's an eroge, but if you're sensitive to the topics i'll mention later in the tw list, then definitely do not check it out as some chapters are centered completely around those topics!!!
Trigger Warning Subarashiki Hibi follows themes of suicide, familial abuse, bullying, sexual assault, rape, cults, apocalypse, and death as well as depicting psychosis, DID and delusions. All of these themes are really relevant to the plot and not handled badly/sexualized however I still wouldn't reccomend reading it if you're sensitive to any of these topics :(

Summary
Chapter One: Down the Rabbit-Hole I DTRH1 follows Minakami Yuki as she meets Takashima Zakuro on the rooftop and soon takes her in as her "maid", by Zakuro's own request. Yuki's parents are out of town and her childhood best friends, the Watatsuki sisters Kagami and Tsukasa, have been tasked with taking care of her; But upon realizing Zakuro is staying at Yuki's house, they get jealous and stay with her, too, having a sleepover. They play a form of spin-the-bottle, and your choice in this portion is crucial to moving on to the real story.
By kissing Zakuro, Yuki ends up going on a date with her in which they visit the amusement park and go into a haunted house, with paintings of the "end sky", hospitals, and areas devoid of life. Zakuro and Yuki end up dating (if i recall correctly) and eventually Zakuro and Yuki return to the end sky together, taking a train.
DTRH1 Review This was one of the cutest parts of the story; Steam only sells this chapter if I recall and it's a really cute and lighthearted yuri moege. plus the art style is flipping adorable and the yuri scenes are all really wholesome. a lot of people don't like it because it has almost no connection to the real story, but i really enjoyed it because of course i did i love yuri i love moe art styles and it's lowkey just lucky star yuri fanfiction bc tsukasa and kagami are.. literally the characters from lucky star LMFAO and there's a reason for this but i'll get into it later..