Koots also serves a selection of food for the very health conscious, which means lots of tofu, mushrooms and salads as well as a good range of onigiri (rice balls). My favourite is the Edame Cheese onigiri (200yen). I never thought cheese could go well with rice but I was happily proven wrong with this. The cheese flavour is quite mild but still lends a slightly milky aroma to the sticky rice.
So if you're travelling to Tokyo and chance by Koots, don't hesitate to check it out! Koots has outlets at Roppongi Hills, Azabujuban shopping street and Midtown Tokyo. The official website is here: http://www.koots.jp/
Hope someone brings the franchise to Singapore in the near future!