Takasugi-san Chi no Obentou
高杉さん家のおべんとう
Sequel
Karin Ayumi
かりん歩
manga
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The Ichii family has two close sisters. Karin has been taking care of her younger sister Kurumi since they were little, in place of their busy parents. However, as soon as her younger sister becomes independent, she starts to lose sight of what she should be doing...!? (Source: Kadokawa, translated)