Los Angeles is typically 17 hours behind Tokyo. When it's 3:00 PM in Tokyo, it's 10:00 PM the previous day in Los Angeles. Japan does not observe daylight saving time, while California does.
During US daylight saving time (mid-March to early November), the difference is 16 hours. During US standard time (November to March), it's 17 hours.
Optimal meeting window: 4:00 PM - 7:00 PM Los Angeles time (9:00 AM - 12:00 PM Tokyo next day). This catches morning business hours in Tokyo.
Alternatively, 5:00 AM - 8:00 AM LA time (10:00 PM - 1:00 AM Tokyo) works for late evening calls to Tokyo.