Maru Gou! 3D Nanami to Issho ni Gakubo! English Joutatsu no Kotsu Riron-Hen is an Edutainment game developed and published by Media5 for the Nintendo 3DS. It was released exclusively in Japan on March 19, 2013. This game is part of the “Nanami no Oshiete English” series, focusing on enhancing English language skills through theoretical lessons.
If you find a ROM that's encrypted, you need to use the Batch CIA 3DS Decryptor, created by Matif.
Not all games are fully compatible with Citra. If you do find a game that's not working, try using the latest PabloMK7 Citra fork, the continuation of Citra since its shutdown.
