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), typically shortened to 1draw (ワンドロ, Wandoro),¹⁾ is a self-explanatory hashtag on Twitter where artists get a prompt and have an hour to test their skills.

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

Depending on when it's posted, if at all, the artist might have time to think it over. Once the game begins, the artist has an hour to complete a drawing and post the results. However, the reality is that some artists 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 to the hashtag 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 said 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 would eventually be 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 and wrote a long apology to all parties affected.¹¹⁾ Today, the organizer is unknown, and a bot is presumably 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