It's actually MSIP, which stands for Multi-Stage Improvement Plan, which is a plan to turn the 94 Second testbed into the proper Shiranui Type-2. Among the improvements are more powerful engines, thruster blocks derived from the Active Eagle, improved sensors...
The final result, from the stage by stage improvements, eventually becomes the Type-04 Shiranui Niigata in IJA service. Like ATSF, it's in a flyoff competition against the F-15SE Silent Eagle. Unlike ATSF, the flyoff takes place during an assault into a BETA hive.
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