There are 200 Mimans hidden throughout the four regions of Shin Megami Tensei V. This page will list the locations for the Shiba Park and Tokyo Tower areas of the Minato region.
South of the Hamamatsucho Leyline, you will be able to continue exploring west after crossing over a piece of highway. As soon as you cross over it, head north and go to the end of the path, which will do a U-turn and continue south at a slightly higher elevation. Moving south on this trail, you will find a lone rock not too far from the top, which will have the Miman right next to it.
After crossing over the first highway mentioned in the previous Miman, you should see a climbable ledge underneath the second highway. The small river will also be here, which runs underneath the second highway. Follow the river south a little bit and you will come to a waterfall (watch out for the nearby Azumi). Looking over the waterfall, you should see some rock ledges sticking out from it. Drop down to the first one, then spy the second one, which will have the Miman on it.
Get on top of the second highway mentioned above and follow it to the southwest, all the way to a smaller area that is a dead end, with a pack of Sandman demons. Look for the rock pillar here, then search behind it to find the Miman.
If you haven’t done so already, destroy the Abscess in the Shiba Park area, then follow the river to the west. When you get past the first set of Azumi demons, you should find two lone rocks in the river. Near those rocks will be the Miman.
There is a small river that runs through the Shiba Park area, which will have a bunch of Azumi demons scattered throughout it. If you follow it all the way to the west, you will come upon a hidden cave with a Leanan Sidhe and Ippon-Datara inside it. The Leanan Sidhe can give you The Water Nymph quest. Search behind the rock that’s behind them in this little cave to find the Miman.
This one is located in the Tokyo Tower area, and cannot be gotten until you have defeated Hydra. Slightly northwest of the actual tower, you will see a rock and the Miman will be right next to that rock.