Salary from Japan

Your total stay in India for FY 2023-24 is from april 1 to Oct 15 which is 198 days. Since, it is more than 182 days you are considered 'resident' in India. Since you worked in India in earlier years, you will be condiered as 'resident and ordinarily resident' in India for FY 2023-24.

Global income is taxable for you. Hence, salary of India as well as Japan will be taxable in India.

If you have paid any taxes in Japan for the Japan salary income, it will be allowed as relief as per the DTAA between India and Japan.

Kindly consult a practising CA for detailed advice.