Contradiction of the general election

I had no right to ballot for this particular general election in Japan. Despite the national constitution says that all the Japanese who are over 20 years old have rights to vote at the general elections. The reasons are as follows.

The law enacts,

a. All the Japanese over 20 years old have rights to ballot for the regional election if your name is on the list which the election management organisations of each prefecture make.
b. In order to register your name on the list, you have to be a resident of a city and have to keep living there at least for 3 months.
c. The election management organisations of the each prefecture are supposed to enroll residents living in a city more than 3 months to the list every 3month on definite days.
d. If you are not on the list, you have no rights to vote.

as rules.
 
And the actual ballot tickets which corresponding to the list are distributed by the election management organisations of the each prefecture, and when a mail which contains these, the tickets for me were not in.

The thing is that the list has nothing to do with the general elections because it has something to do with regional ones. Certainly, I came back from the UK after the register day however, again this time was not regional elections. It cannot depend on the list which the election organisations of the each prefecture. Therefore, this is completely and obvious contradiction in the rules which is not to mention ridiculous.