Synopsis
Takuya Arima is a young student whose father, a historian who has conducted various researches, disappeared recently. During a summer vacation Takuya receives a peculiar package from his missing father, along with a letter containing information about the existence of various parallel worlds. At first Takuya doesn’t take it seriously, but soon he realizes that he possesses a device that allows him to travel to alternate dimensions. Is his father alive, after all? If so, where is he? -VNDB

Genres: Drama, Sci-Fi
Websites: MAL | AnimeDB | Anime Tosho | ANN

Alternate H ver: NSFW + contains story spoilers! #288914 | MAL

Source: Visual Novel
Eroge: NSFW #2641259 (Original version) better link

News: Remake for PC and Switch [soon to be butchered by censorship in English]: https://gematsu.com/2019/05/yu-no-a-girl-who-chants-love-at-the-bound-of-this-world-launches-for-ps4-switch-and-pc-on-october-1-in-north-america

Episode 01, 02, 03, 04, 05, 06, 07

tl;dr

tl;dr BD (not all will be under this label)