Walkthrough: Tracking Hayamoto
Objectives:
The mission begins directly within Hayamoto's domain, directly behind a rock which conceals your presence from two guards patrolling the main entrance. There's also another guard towards the upper region of the area (by the garage), and finally a guard who randomly will head outside (who can be the biggest concern of all if you're not too careful.).
Wait until the guard patrolling the door heads back inside and the two guards guarding the front area are closest to the exit. Pick off the guard by the garage with your silence pistol (or the Ballers SD if you've picked it up by now). Take his clothes and drag his body to the damaged car. Now take his gun and holster it. Head to the back of the shutter, and take out the lone patrol guard using the silencer pistol. Enter the hallway and go through the door closest to you. This will take you to the store room. There's a sushi girl that will come back and forth (depending on the rate of time you've spent up to this point?she may be there). She'll return when Hayamoto has consumed all his sushi (and will want more!)
You can choose to plant the transmitter (the safest option) in the sushi after the guards have made their pass around the corner and the cook has exited the kitchen. The more aggressive method would be simply to pump all the guards full of lead, including Hayamoto Jr. himself, and then planting the transmitter on him. If you choose the transmitter within the sushi approach ? exit the garage and wait until the sushi girl heads back to the kitchen to bring Hayamoto Jr. another serving of sushi. Once he's out of commission, exit the level ? be sure you're running (and not walking) as any remaining guards will open fire if they detect you.