This place is 3.5 stars for me, but as it doesn't get as much attention as Curry Zen, I decided to boost by rounding up to 4 stars for them.
Honestly, Curry Zen offers superior quality, but Kaba Curry is also decent to my Japanese taste buds.
My suggestion for them is to simplify the offerings - focus on the best menu items that you're proud of, then try to do it even better. Loco moco style curry is pretty good, but some toppings like tonkatsu was subpar. The inconsistency in the quality makes you look worse than you actually are.