Tsui no Sora

Haruka na Sora is Yosuga no Sora's fandisc.

The fandisc features bonus scenarios and visual novel versions of web radio episodes. The bonus scenarios include routes for Kozue and Yahiro (who did not have routes in the original game), as well as an epilogue for Sora's main game route. Additionally, it includes a bonus scenario featuring the characters doing karaoke.

A remake of Tsui no Sora included in the 10th anniversary Subarashiki Hibi package, including a fully rewritten script that is 1.5 times the size of the original and a "whole new work of its own".

In July 1999, the King of Terror descended from the sky to revive the King of Angolmois and lead the world toward destruction. Japan, though struggling through a prolonged recession following the burst of its economic bubble, remained the world’s second-largest economy. During this time, the words of a Renaissance-era French prophet captivated many young minds. Within the seemingly endless monotony of daily life, his prophecy—suggesting an inevitable end—may have resonated as an expression of guilt and anxiety over past prosperity. But what if someone were to give form to that anxiety and guilt? What if entities used that fear as a passage to invade our world? In July 1999, an incident begins at North High School in central Tokyo. Is the power to manifest abstract concepts into reality something that belongs to humans, gods, or demons? Everything begins with the suicide of a girl chasing the memories of her past life.