If you're looking for anime similar to Kanojo ga Flag wo Oraretara, you might like these titles. All recommendations are made by Anime-Planet users like you!
Rumors tell of a Stony Cat statue that grants a special wish: it will take one of your disliked personality traits and give it to someone in need. Two students arrive at the Stony Cat eager to make a change – Youto, an unabashed pervert, wishes to remove his façade and be able to speak his true feelings, while Tsukiko desires to hide her expressions and be more like an adult. However, little did the pair know that their prayers would be answered in unexpected ways – Youto begins to speak the full, embarrassing truth with brutal honesty, and Tsukiko becomes visually stoic, unable to smile, laugh or cry! To make matters worse, Youto soon runs afoul of the beautiful school idol Azusa, the girl who inherited his unwanted façade. Together, the three slowly become friends while Youto and Tsukiko try to regain what they've lost.
After many trials, the Hero has reached his destination: the throne room of the Demon King, where he hopes to end the war between the Demon and Human realms once and for all. What he finds, however, is not at all what he expected: the 'king' of the Demons is a woman, and a bouncy one at that - what's more, rather than fighting, she wishes to engage him in dialogue! She explains that he was never expected to succeed in his mission, because the war is perpetuated by parties in the human world who profit from it every day. Swayed by her arguments, he makes a pact with her to work toward peace for both their worlds. Together, they will better the lives of their people and create a world where war is no longer needed to ensure prosperity - despite those who would shed blood to keep the status quo.
Both shows give off a quite similar "rpg" feeling.
Difference "Maoyuu Maou Yuusha" being the way superior show, which additionally focuses on economics.
On the other hand in "Kanojo ga Flag wo Oraretara" the harem power is real, the plot stalls for a while because of that though.
If you liked one you might like the other.