没找到好好引用凶犯自供的中文材料（笑），英文维基百科凑合一下吧Although police opened an investigation, Tsushima was quoted as saying that he had been wanting to "kill a happy woman for the past six years" and added that the day of the incident "anyone would have been OK".

苹果测试工程师的日常

https://www.huffingtonpost.jp/entry/story_jp_611c9e3ce4b029c152af4826 这种动画不是没有照进现实过。不过是有的上等人眼睛太高看不到而已这个时候自然也不会有变量替换大师站出来请大家想想如果自己读书时班上有个女生看到自己和谁关系都好聊得来就会想狠狠羞辱自己甚至杀掉是什么感受啊对了，这题有标准答案哦。答案是那个女生一定很喜欢我喜欢到受不了

没找到好好引用凶犯自供的中文材料（笑），英文维基百科凑合一下吧

Although police opened an investigation, Tsushima was quoted as saying that he had been wanting to "kill a happy woman for the past six years" and added that the day of the incident "anyone would have been OK".

https://en.m.wikipedia.org/wiki/August_2021_Tokyo_stabbings

Wikipedia

August 2021 Tokyo stabbings

2021 mass stabbing incident in Tokyo, Japan