Artist's commentary:

日独の潜水艦交流によってもたらされたMe163の資料をもとに設計された日本産ロケット戦闘機。
実質Me163のコピーでしたが、肝心の資料を満載した潜水艦がシンガポール沖で撃沈されてしまった為、不完全なコピーしか出来なかったといわれます。コピー元であるMe163とは、キャノピーの形や機首周りの外観が異なっており、また内部構造なども若干異なっています。
メリットとそれを帳消しにしてなお余りあるデメリットについてはMe163と同じですが、本機は陸海軍の共同開発やメーカーと国営の研究機関の連携、日本初の女性研究者の参加など、その開発段階では様々な「革命」が起こりました。
最終的にテスト1号機が失敗・不時着大破したことで開発は失敗に終わりました。
しかし、燃焼時間15分のロケットエンジンにどれだけの事ができたかといえば甚だ疑問です。

Artist's commentary:

Mitsubishi J8M Shuusui was a Japan-made rocket fighter which was designed using plans for the Me 163 delivered from Germany via submarine.
Though it was substantially a copy of the Me 163, it was an incomplete copy since the submarine carrying the plans was sunk in the sea off Singapore. The shape of the canopy, the outline of the nose and the inner structure somewhat differed from the Me 163 on which it was based.
It adopted the merits of the Me 163 while canceling out its demerits, and its development included several pioneering moments such as cooperation between the Imperial Army and Navy, collaboration between a private manufacturer and state institutions and the participation of the first Japanese female researcher.
Ultimately the test of the first prototype ended in failure and an emergency landing, leaving the prototype with heavy damage.
However, there were many doubts left about the supposed 15-minute burning duration of the rocket engine.

Ultimately the test of the first prototype ended in failure and an emergency landing, leaving the prototype with heavy damage.

lol

Wikipedia:

At an altitude of 400 m (1,300 ft), the engine stopped abruptly and the J8M1 stalled. Inuzuka managed to glide the aircraft back, but clipped a small building at the edge of the airfield while trying to land, causing the aircraft to burst into flames. Inuzuka died the next day.

Even that seems questionable to me. If your rocket fuel merely "bursts into flames", it's shitty, low-test rocket fuel. You want that shit to explode; T-Stoff and C-Stoff did not fuck around in this regard.