My favourite ramen place so far over sansotei, kinton, kenzo, etc. It is located in a relatively quiet street behind yonge dundas square and eaton centre so it may be a bit hard to find at first. Every time I come here I keep thinking that its the best bowl of ramen I've ever had. I often change up what ramen I get but the consistency of the delicious rich and flavourful broth and the firm yet chewy noodles. Seriously, its so good. Service there is always fantastic, definitely up to Japanese standard. You get greeted enthusiastically when you enter and leave the restaurant. Servers are often very busy but remain prompt and friendly.
If you come here during peak hours, you'll likely find yourseld waiting a bit for a table, but definitely a shorter wait than the Sansotei nearby.
The only cons that caused me to take off a star is that the egg does not come with the ramen and has to be added on at an extra charge when the price for the ramen is already quite expensive. After tax and the 20% tip I usually give them, my bowl of ramen with no extra add ons or upgrades comes to around $16 which is definitely on the higher end compared to the other popular chains like sansotei and kinton.
Overall, it is still my favourite ramen place because of how good the ramen is (which is an understatement). However I don't come here as frequently as I'd like to because of the price. On a side note, I really wish that Santouka can open up another shop or two in the GTA as they currently only have one location downtown.