きょうだいごっこ (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: Rio's parents are busy and she is an only child, so she longs to have a "sibling. When his parents are posted overseas, he suddenly finds himself living with two handsome brothers who are also famous at school!　Rio's parents are busy and she is an only child, but she longs to be a "sibling".

(Translator: DeepL)