I was an only child, so I asked God to give me many little sisters when I was reborn

Kyousuke is a lonely university student whose greatest source of joy is imouto (little sister) entertainment. When he is hit by a truck and sent to another world, instead of OP skills, he wishes for many little sisters, and his wish is granted. The story of an (only child) siscon's journey to protect all his little sisters in a warring fantasy world.