Games like Outsider Strategist～異世界で軍師になる～

How fun would it be, if I could succeed as a strategist in a world like that of a tactical RPG? Yuuto, a Japanese young man and the protagonist of this story, dreamt such. Thusly, he was joyed when he really was sent to a different world and hired by a member of local royalty. However, he gradually learns. He learns the meaning of being in, instead of playing, a war, the heavy burden a strategist must endure…