The Late Night Serious 60-Minute Drawing Game (深夜の真剣お絵描き60分一本勝負, Shin'ya no Shinken Oekaki 60-bu Ipponshōbu), or 1draw (ワンドロ, Wandoro),¹⁾ is a self-explanatory Twitter hashtag where artists are given a prompt and have an hour to exercise their skills.

At some point, the “@1draw_night” account posts a “prompt” that contains the game's start time and a few characters that artists may choose to draw. Below is an example of what the “prompt” looks like.

Depending on when it's posted, if at all, the artist may have time to think it over. Once the game begins, the artist has an hour to complete the drawing and post the results. In reality, some artist may choose to start early, some exceed the time limit and might not admit it, some end up with a draft that they do upload but also choose to add finishing touches to in a later post, and so forth.

The game will usually begin at 22:00 JST and end at 23:00 JST, but be warned that: Japan doesn't observe daylight savings time and the 1draw spinoff accounts might not follow the same rules.

On May 14, 2013, a discussion about one-hour drawings led to Twitter user “@kuroneko262” establishing a prompt where participants were to draw Koishi, Nazrin, and/or Kasen,²⁾ and the challenge didn't have an associated hashtag until the third session.³⁾ It was oddly popular and someone set up a support website for it. Sadly, the last prompt was posted on July 26, 2013,⁴⁾ and the organizer quit since he was tired.⁵⁾⁶⁾

This was picked up by “Rebecca” (then: “@Rebeccareberebe”) who did ask to take over⁷⁾⁸⁾⁹⁾ and resumed the game at the “@1draw_night” Twitter account. However, there was an issue with people borrowing the concept for a different subject and using the same hashtag. While the original organizer was okay with it and even combined the Touhou Project and Kantai Collection prompt,¹⁰⁾ others weren't so happy.

At some point, “Rebecca” wrote an angry, reckless response which only seemed to make people angrier. It was later resolved by appending the version to the hashtag, but some didn't let this go due to a perceived rivalry at the time. By 2015, “Rebecca” decided to step down from organizer and wrote a long apology to all parties affected.¹¹⁾ Today, the organizer is unknown and a bot(?) is mostly in charge of the account.

• 1draw Prompt History

• @1draw_night on Twitter - The current 1draw account with Touhou Project-related prompts.
  • #深夜の真剣お絵描き60分一本勝負 - The primary Twitter hashtag.
• @kuroneko262 on Twitter - The original 1draw organizer. Has nothing to do with it now.
• Late Night Serious 60 Minute Drawing Game on Niconico Encyclopedia
• Late Night Serious 60 Minute Drawing Game on Pixiv Encyclopedia