We examined the amount of fountain tears often seen in cartoons.
Reference page:
"Why do we shed tears?"
https://logmi.jp/business/articles/128724
"If you lose your body's moisture"
https://www.otsuka.co.jp/nutraceutical/about/rehydration/water/dehydration-signs/
"The number of people who die in 1 day in Japan" Ministry of Health, Labor and Welfare https://www.mhlw.go.jp/wp/hakusyo/kousei/11-3/dl/1jp.pdf
"Why are you so impressed and tearful?"
https://www.nikkei.com/article/DGXNASGG1100I_S0A510C1000000/
"Number of close friends"
https://www.asahi.com/relife/dokusha/voice/11280529
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