IS-152 – Real According to Japanese Literature?

Remember the fictitious Soviet tank from the old Panzer Front game? Well this time we have another gem from Asian history books – info about the supposed IS-152 that existed as a prototype in real life! 😀

EDIT: Source was wrong, it in fact tells that the tank is a piece of conceptual weaponry that appears in „Sentō Yōsei Yukikaze”, a sci-fi work. A nice re-use of it!