NTT DoCoMo, from September against the KDDI base rate to half price?

The other day KDDI aimed for mobile phone service "au"Introduction of "Anyone Discount" that suddenly the basic usage fee will be half priceAccording to the report of Nihon Keizai Shimbun, NTT docomo seems to make the basic fee half the price from September as a countermeasure against KDDI though it was reported in GIGAZINE.

Details are as follows.
DoCoMo, mobile discount fee from the first year 50 discount Mobile - latest news: IT-PLUS

According to this article, NTT DoCoMo expands the family discount of mobile phone fee, and it is said that the basic fee will be lowered from the contract first year to half price. It is scheduled to start in September, the minimum contract period is the same as two years as KDDI.

NTT DoCoMo has contracted itself with "Fami-wari MAX" which applies family discount rate of the longest contracted user to all members in September in order to regain the slump due to the start of MNP (Number and Portability) Although it seems that it was planned to start "discount even one person" who can receive discount from August, is it that we decided that further leverage is necessary after receipt of KDDI's announcement?