Living Expenses

The cost of living in Tokyo—especially housing—is the highest in Japan. Rent in Tokyo has been rising every year, and even a small one-room apartment for a single person typically costs around 80,000 to 100,000 yen per month. Even if you are scheduled to receive a scholarship, it usually takes about one to one and a half months for the first payment to be provided. Therefore, newly arrived international students must bring enough money to cover their initial living expenses.
Regarding food expenses, many international students spend more than Japanese students due to differences in eating habits and the difficulty of finding familiar ingredients. Many spend around 50,000 to 60,000 yen per month.
For students living with their families, living expenses are generally 1.5 to 2 times higher than those of students living alone. To avoid financial stress that may affect your studies, please gather sufficient information in advance and prepare carefully for your living costs.

Reference: "Survey on Student Life Conditions (International Students)"  https://www.u-tokyo.ac.jp/adm/inbound/en/support-ieso-st.html