For example, under Japanese Constitution, if each house makes other decisions about a bill, the lower house have to take a vote again and rally more than two-thirds affirmative votes to pass the bill. However, now in Japan, the ruling coalition parties don't occupy more than two-thirds of seats at the lower house.
Accordingly, it is very hard for the government or ruling parties to pass bills without cooperating with opposition parties. Sometimes they are forced to compromise excessively and policies tend to be populist.
In this regard, there are many points to be discussed. How do we prevent the divided diet from happening? What roles should each house take? Should we amend our Constitution and abolish the upper house? Should we give the lower house more power than the upper house?
Not only politicians but also all Japanese people discuss this issue seriously. However, because all of these points are controversial, it is very difficult to settle them under the divided diet. I think we are falling to an impasse.