Katsu curry is the plate people search after they have eaten it, because 1,116 calories is more than a Big Mac set and it does not feel like it at the time. CoCo Ichibanya publishes everything: the plain pork curry with 300g rice is 701 calories, and the rosu katsu adds about 415. The plate costs around 1,000 yen. For the same money you could have a tonkatsu teishoku at 873 and get a salad and miso soup with it.
Rice is the lever. CoCo Ichi lets you pick rice by 100g steps. Dropping from 300g to 200g takes the plate to about 960 calories. Going up to 400g is 1,272, and the 'mega' 600g plate with katsu passes 1,500. The cutlet is the same size at every rice level, so the small rice order is the same amount of meat for 156 fewer calories.
The sauce level and toppings are where it gets silly. Cheese is about 120 calories, cream croquette 200, and a half boiled egg 80. Spice level costs nothing. The 'katsu curry with cheese and egg' that a lot of people order after the gym is about 1,320 calories, which is a full day of food for a small woman. If you need it, order it as your one meal and make the rest of the day protein and vegetables.