Japanese heavies line§

OI-Experimental:

The OI-exp has a lot of potential in terms of blocking, but you have to know some things, the first thing is, the small turrets on the front of the turret are easily pennable by equal tier tanks, you can bait people to shoot the front of your hull as you can see on the image OI-exp firing at itslef you are also able to sidescrape, just keep in mind your turret cheeks are pretty weak, and you will be penned if they fire gold at you, your cupola is pretty safe, i haven't seen a lot of people hit it when playing

you have two choices for the guns:

105mm:The 105mm derp gun has huge alpha 360 it's really good for the memes but the 290m/s shell velocity is crap, you need to relearn how to lead shots in it or brawl which is what you'll be mostly doing (don't go sniping :/)

75mm: The 75mm has very nice standard pen, and is overall really reliable, if you want to be competive use it, it also obviously has more premium pen, than the 105mm

OI:

The OI is of course is a continuation of the OI-exp, even if the exp was pushed to the collector's vehicles, most of what you learn at the tier V applies to the tier VI, you can sidescrape although a bit harder, the small turrets are still a weakpoint, which is the speciality of the line, however they are harder to pen than the predecessor, the upper hull will mostly be penned by the same tier. M6 firing standard rounds at OI however the lower plate and upper plate are incredibly good 230-240mm~ which is very good, you can bait opponents to shoot it

Again 2 choices for the gun :

105mm: It has alright standard and premium pen, the preferable gun to take if you're in a higher tier matchup, however the dpm isn't very good, it's average, it feels lackluster at some moments

150mm: the preferable gun to play if you want to meme and have fun, it has better pen than the KV2 but a worse reload, still packs a punch however 700 alpha is really fun especially when you slap a light with HE for 900

O-Ni:

Now you get into the good stuff, the O-Ni is pretty much inpenetrable (apart from the small turrets) some tanks may even struggle to pen with premium rounds on the hull, however your armor becomes useless if they know your small turrets are a weak spot O-Ni firing at itself (good pen) you can sidescrape however be careful of the side squirts only expose the side of the tank without the side squirt, you have to learn how to use them because you will have them for the rest of the line the tank is a beast hull down while using your gun depression, if you can find a ledge to drive on and only expose your upper hull it's really hard to pen, and don't even talk about fighting lower tiers, one game i did 3k damage broke through a flank in steppes, fought the enemy team defending the cap and got out of the game full health, it's a beast top tier here it is hull down against a Churchill VII (tier VI)