If you talk to someone in the food preparation world in Japan, they will often talk about the “Dry Method” when it comes to meal preparation. Dry is now the norm in school lunch centers throughout Japan, but that implies that there was once a “wet system” - which indeed there was!
On March 25, Kahoku Online news published an article about Muslims living in and around Sendai (north-east Japan) and considerations when it comes to school lunch. The author pointed out the difficulty in balancing Islamic culinary customs into the existing school lunch menu. According to Sendai City Health Education Division, many Muslim children often only eat staple food and milk while eating, and often bring side dishes from home to supplement the menu items that they cannot eat. Meanwhile, some elementary schools are beginning to provide halal-compatible meals - although it is anything but the norm.