I visited Hiromaru on their grand opening and wasn't personally all that impressed. Their menu is very simple. Only four types of Ramen and a few other extras such as Karaage, curry and buns.
We started our meal with their Hiromaru buns. My pork belly was tough , like I could barely chew through the meat. So I was left a bit underwhelmed with my bun experience. Secondly I really wanted to try their carbonara ramen since I've heard that is the show stealer, unfortunately they were out. I heard they had a great soft opening but its kind of a disappointment not to have star menu items on their grand opening day. So I ended up settling for the Shiroi Tonkotsu ramen with extra chashu. The broth was tasty but I personally wasn't a fan of the noodles. I like a slightly thicker noodle. The chashu was good but almost all fat with very little "meat."
Overall it was just an ok ramen experience for me. Maybe I'm just a creature of habit and prefer Ramen Sora.
Although I wasn't the biggest fan of Hiromaru I will return purely for the interest of the Carbonara ramen.