There's this novel that i was looking for. The story if i remember have a male protagonist, together with his sister in another world trying to... Maybe save it? It is in another world, but i remember he can go to modern world too i think? Also both he and his sister have princess companion... I think? I completely forgot about it. Also, this novel is obviously JP, i remember reading this novel before even the creation of Novel Updates (2014-2015), so i have a really hard time looking for this novel once again. Can some kind soul help me finding it? Thanks!