“An Hour of Code” (www.code.org) is a website where students can learn to code. It uses a program called Blockly to build the code. Blockly is used to teach Harvard students in the USA coding, but it is also used by kids. It is a great website that teaches the fundamentals of computer programming.
We have been using this website and solving its challenges all in English. One of our students even went home to do all the puzzles in English. A great way to continue learning English and challenging yourself on your own.
You can set the language to Japanese, but if your child is motivated, you are robbing them of an incredible opportunity to use their English to develop another skill.