Both matcha and roasted hojicha soft serve ice cream are really smooth, creamy, and super rich in flavour. Definitely a great option while waiting for a table at konjiki and worthwhile to visit without getting ramen too.
If you're eyeing the ice cream, the best option really is just the ice cream cone. I wouldn't recommend the green tea sundae, which is half the ice cream (compared to cone) served with a brown sugar sauce, jellies, and mochi balls. The brown sugar sauce is good with the sides, but really takes away from the matcha flavour. I would even say they ruined the matcha ice cream by drizzling it on top. Sides are good, but nothing special.
Rare matcha cheesecake was good flavour. I wasn't too fond of the texture. It's more of a dense mousse rather than a cheesecake.