Gensokyo Sex Change! (幻想郷SexChange!), also known as SEX☆, is a Cookie☆ voice drama credited to “SUSHI”, organized by “Maki” who later disowned it, and was published on March 16, 2014.¹⁾ The work is incredibly bland, but people started toying with it in 2017.²⁾

The story begins with Reimu and Marisa discovering that they've become men, then Aya would tell them that everyone in Gensōkyō had changed genders. They're quick to blame the Moriya Shrine, after the events of Touhou Chireiden, but discover that nobody there was responsible. Reimu rests at the Moriya Shrine for a bit, while Marisa and Suwako get into a danmaku fight, and Kanako and Aya get into a shogi match.

Eventually, they decide to look for Yukari when they conveniently show up. Yukari agrees to fix everything by tomorrow morning and explains that they had intended to attack Reimu as a man, but accidentally changed everyone's gender in the process. The story ends with Yukari handing medicine to Marisa, as Reimu returns to the Hakurei Shrine alone, but the medicine turned out to be an aphrodisiac, so…

This voice drama is mostly considered boring, long, and monotonous, so most people would pan over it, and Maki disowned it since he didn't even write it. Then in 2017, somebody announced a collaboration project, which drew attention to the voice drama, and this sudden interest led to a faster 'alternate dub' being made and a traditional Cookie☆ visual novel style animation was later made for this alternate dub.

• The voice drama is almost 18 minutes long, while the alternate dub cuts it down under 10 minutes.
• For some reason, the original title had 'male version' (男性版, dansei-ban) and Yukari only talks about turning everyone into men, so any male-to-female characters are completely overlooked.³⁾

• Halloween☆ → Nabe☆ → SEX☆ → Myourenji☆ → Maou☆ → IshiKoro☆ → Cabbage☆ → OL☆

• Gensokyo Sex Change! on Niconico Douga - The original, audio-only upload.
• SEX☆ Collaboration on Niconico Douga - The collaborative, fan-made animation. Deleted.
  • SEX☆ Collaboration on Niconico Douga - Re-upload.
  • Gensokyo Sex Change! (English Subs) on YouTube - The whole 17 minutes and 45 seconds.
• Gensokyo Sex Change! - The alternate dub. Significantly faster!
  • Gensokyo Sex Change! - The *better* visual novel style version of the alternate dub.
• SEX☆ on the Cookie☆ Explanation Wiki
• SEX☆ Transcript on the Cookie☆ Jikkyou Wiki