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!
The "apartment comedy" centers around Kōtarō Satomi, a boy who started to live by himself to attend a high school. He fortunately discovered a very cheap, tiny (six-mat or rokujyōma) room for 5,000 yen (about US$50) a month, and began his new life there. However, when he moved into that room "1X6" in the Korona complex, some unexpected "roommates" began appearing one by one.
Both of those anime are based on comedy harem light novels. What they have in common (and probably less in common with generic harem LNs) is that the characters are super friendly with each other and that the series is actually quite hilarious. To tell the truth the adaptation of Kanojo ga Flag wo Oraretara wasn't all that well made and the things mentioned above were less present there. Nonetheless, if you liked one of those anime, there is a big chance you'll like the other one too.
Rokujouma and Kanojo are pretty similar in setting, but the two have a slight different approach. Nothing happens in Kanojo for a while main it a bit of a drag, where as rokujouma puts you straight in, making sure you know the details. Both are Comedy with a Harem, but Rokujouma has an interesting taste in characters compared to Kanojo, as Kanojo takes a more generic route, but the two are very enjoyable watches. Many people dislike Kanojo due to it being very generic, not so well made and in all honesty, pretty cheese, but its still worth a watch if its the genre you are into, and same goes with Rokujouma - just less cheese!
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.