If I take maternity leave concurrently with my absence from work and leave of absence, and then return to work and take another absence, will that absence be counted as part of my leave of absence?

If you were on leave during the parallel acquisition period, it will be counted when you reach 7 days of absence after returning to work.
For details, please refer to “Special Provisions for Leave Periods” in the work rules.

Rules of Employment and Compensation Policy (就業規則・賃金規則)