Does Japan not have a fair use clause in their copyright law? This seems like a really clear cut case of fair use. But this is japan, they arrested a schoolgirl

Does Japan not have a fair use clause in their copyright law? This seems like a really clear cut case of fair use. But this is japan, they arrested a schoolgirl for a JS prank [1]. [1]:https://yro.slashdot.org/story/19/03/09/1940202/japanese-police-charge-13-year-old-girl-for-sharing-unclosable-popup-code-online https://yro.slashdot.org/story/19/03/09/1940202/japanese-pol...