Direct Opposing Rook (ダイレクト向かい飛車 dairekuto mukai hisha) is an Opposing Rook (Ranging Rook) opening in which the player's bishop diagonal remains open allowing for a bishop trade early in the opening.
file, with the aim of counterattacking on Black's rook pawn.
The reason for the stopover on the 4th file is said to be as a way of preventing the powerful counter-attack that the Static Rook side has by dropping the bishop to 65 (or 45 in the case of White).
The adjective "Direct"comes from the fact that in contrast with Bishop Exchange Fourth File Rook no such stopover is necessary.
If Black can take advantage of the resulting gain of one tempo, moving proactively becomes possible.