コタローは1人暮らし (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: A four-year-old boy named Kotaro suddenly moves into "Apartment Shimizu". He lives alone! However, he is strangely capable of living, in fact, he is much more solid than the adults in the apartment's slightly no-good neighborhood! Kotaro's past is gradually revealed, and everyone's hearts are shaken... An opening play of an apartment comedy that will make you laugh and cry!

(Translator: DeepL)