Before tackling the technical side, let's clarify the game. Hizashi no Naka no Rial (often abbreviated Hizashi no Naka no or mistranslated as "Hizashi no Naka no DS") is a Japanese-exclusive visual novel.
: A flashcard (like an R4 card) with a microSD card, or a modded 3DS with an SD card. : The game is distributed as an file. Note that most available versions for the DS are demo versions full install hizashi no naka no ds rom
The third interpretation involves emulators. While DS emulators (DeSmuME, MelonDS, DraStic) don't "install" ROMs in the Windows sense, some front-end launchers (like LaunchBox, RetroArch, or DIG on Android) allow you to "import" or "install" a game into a library. Before tackling the technical side, let's clarify the game
If you are determined to play this obscure Japanese visual novel on your DS flashcart or smartphone emulator, focus on finding a verified, untrimmed ROM and applying the translation patch yourself. Avoid anywhere promising an ".exe installer" — that is likely malware. : The game is distributed as an file
: Despite many "Full Install" labels found on file-sharing sites like MediaFire , the DS version largely remained a demo or a partial port.