Low One-Way Clutch: Operation

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The low one-way clutch inner race (front planetary carrier) rotates counterclockwise (seen from the side cover side) freely, but the rollers move to the shallower grooves and enter between the races to the rotation when the inner race tries to rotate clockwise.
The low one-way clutch locks the clockwise rotation of the front planetary carrier, and also locks the clockwise revolution of the rear planetary carrier via the low clutch.
NOTE: All direction of rotation are viewed from the side cover.

Fig 1: Identifying Low One-Way Clutch Operation
Courtesy of MAZDA MOTORS CORP.