Boku to Otouto no Halal Gohan

Riku, Irfan, and Mikha were born in different countries, but they are blood-connected half brothers. Irfan has rules when it comes to food. No pork, miso, or shouyu (Japanese soy sauce)!? Then what can he eat!? What is halal food in the first place...? Japan x Malaysia, a story of two different mind