I believe it OVA a boy move to new family or something~ there he have many lil sis and hmm 2~3 older sister~ youngest lil sis still baby~ his lil sis start from 1st grade all the way to high school~ one for each grade if I remember it correctly also they call him with different nickname oniichan, oniisama, oniitama, aniki ect there is manga ver
Sorry, I meant to say "Baby Princess" No wonder I was having trouble finding it when I remember seeing it show up recently.
They not sister but cousin, heck 2 of them not even related by blood to small, also the sisters never call haruaki with tittle "onii" heck more over something over the top like onisama
ah it Baby Princess as for Sister Princess now that another matter same creator ah beside that's how I know there too many elder brother nickname