One day, Osamu Dazai was troubled by a dirty child. Under the temptation of Dr. Sen's secret poison, he reluctantly brought the little kid home (well... His container). I also got into water on the way. As he kept raising her like this, he found out that the child who only bothered him had been watching his red-haired friend in the dark.
Female version: Why hasn't that red-haired nerd adopted me yet?
Purpose: Whole life