Shared by vegetablesaute on bluesky, a more in-depth synopsis from
this Japanese news site.
Japanese:
飛行機で島に向かったルパン一味は島の上空に差しかかった途端、敵の狙撃により機体を破壊され不時着してしまう。そこは、廃棄され朽ちた兵器
や核ミサイルが山のように積まれた異様な光景が広がり、かつて兵器として使われ捨てられたゴミ人間たちが何する恐ろしい島だった。
ゴミ人間に行く先々で襲われる一味は絵々に島の奥地へ足を踏み入れていき、やがて島に君跡する不死身の支配者、ムオムと対することになる。
どんな攻撃を加えても決して死ぬことのない不死身の肉体を持つムオムの力に圧倒され、次第に体力を奪われていくルパンたち。さらに、島には24時間吸い続けると死に至る毒ガスが充満しており、毒に侵されながら戦い続ける一味に残された時間は刻一刻と減り続ける。
Machine translation:
The Lupin gang heads to the island by plane, but as soon as they pass over the island, their plane is destroyed by enemy sniper fire and they are forced to make an emergency landing. The island is a horrifying place, filled with mountains of discarded and decaying weapons and nuclear missiles, and inhabited by "garbage men" who were once used as weapons and then discarded.
The gang is attacked wherever they go to the Garbage Man, and gradually they go deeper into the isla nd, and eventually they come face to face with Muom, the immortal ruler of the island. Lupin and the others are overwhelmed by Muom's power, which means that he has an immortal body that can never die no matter what attack it receives, and gradually lose their strength. Furthermore, the island is filled with poisonous gas that will kill you if you inhale it for 24 hours, and the time left for the gang to continue fighting while poisoned is running out by the minute.