Title: 妹は猫 1 | L20??
Book type: manga
Available formats: physical / ebook / full furigana
Summary - Japanese
ねこ可愛がりたい妹、登場。
猫人一家に引き取られた人間の猫太くん。そこには、とっても可愛い「猫」な女の子がいて…。
お兄ちゃん大好きな義理の妹・ねねこちゃんとの、ラブリーでキュートなキャットフル・ライフ♪
Summary - English
After losing his mother at a young age, Nekota is taken in by family friends…who happen to be a couple of human-sized walking, talking cats. Not only do his new parents have paws, tails, and furry pointed ears, but now he also has an adorable little sister, Neneko-chan! As a high schooler, he’s integrated well into their household, and his precocious adoptive sister has fully accepted him as her big brother. Whether she’s showing him things she brought home from elementary school, purrsistently asking him to play with her mouse toy, or waking him up at the same early hour every morning for breakfast, life with this charming feline family is never dull!
(Source: Seven Seas Entertainment)
Content Warnings
The MC is taken in by the cat family because his mother passed away, although this is only briefly mentioned at the very beginning of the manga.
Reason(s) for nominating: I’ve read the manga in English and loved it, so I bought the first volume in Japanese. The MC’s new little sister is completely adorable, his adoptive parents are so sweet and supportive, and he himself tries really hard to be a good big brother and son. It’s really heartwarming and lovely! 
