''This design began as a land-based fighter under the New High-Altitude Fighter Development Plan.<br>It then continued development as the No.18 Prototype Armoured Fighter under the Navy's State-of-the-Art Next-Generation Mainstay Fighter Plan.<br>Due to the deteriorating situation, the plans were abandoned in favor of the relatively more realistic "[[Shiden Type 21 Shiden Kai|Shiden Kai]]" development plan and "[[Prototype Reppuu Late Model|Reppuu]]" program.<br>This is a what-if trial mass-production model of that discontinued plan. | ''This design began as a land-based fighter under the New High-Altitude Fighter Development Plan.<br>It then continued development as the No.18 Prototype Armoured Fighter under the Navy's State-of-the-Art Next-Generation Mainstay Fighter Plan.<br>Due to the deteriorating situation, the plans were abandoned in favor of the relatively more realistic "[[Shiden Type 21 Shiden Kai|Shiden Kai]]" development plan and "[[Prototype Reppuu Late Model|Reppuu]]" program.<br>This is a what-if trial mass-production model of that discontinued plan. |