The KI-115, KI-128 and a few other types were ordered by the High Command because they were concerned there weren't enough obsolete types available for the invasion of the homeland.
They weren't the greatest of aircraft, but then again, the whole idea was to get a pilot in it, get it airborne and have it at least make it to it's target (which was assumed to be just offshore or on the beachhead).
The atomic bombings brought the war to a close before any of these weapons could be used for what they were intended. Even the Okha wasn't supposed to be deployed long range because that put it and it's mothership at increased risk, but the seriousness of the situation saw them deployed anyway.