The PC version of "Earth Defense Force 6" and the first major DLC additional mission pack "Lost Days" are now available. A prequel that leads to the previous work is depicted

The PC version of "Earth Defense Force 6" and the first major DLC additional mission pack "Lost Days" are now available. A prequel that leads to the previous work is depicted
 D3P today released Lost Days, the first major DLC additional mission pack for Earth Defense Force 6 for PC. LostDays is a prequel that leads to Earth Defense Force 5. In addition to the story, the game includes more than 15 additional missions with a high level of difficulty, more than 70 new weapons, and new invading creatures and weapons....

The linked article is in Japanese.