Important

Account Linking Recommended

Event

Training: Defense Force Manual—2x Rewards Campaign Now Available!

News

Defense Force Pass Now Available!

News

Monthly Items Reset

Update

Data Update & Event Preview

News

[Updated] Version 1.9.1 Update Now Live

Event

Raid Battle: Kaiju No. 10 (Giant Form) HP Adjustment

Event

Mop-Up Operation Now Available!

Event

[Updated] Raid Battle: Kaiju No. 10 (Giant Form) Now Available!

Gacha

Soichiro Hoshina Pickup Gacha Now Available!

Event

Special Event [Whirlwind from the West] Now Available!

Event

Large Conquest: Invigorating Pursuit Now Available!

Gacha

Kikoru Shinomiya Pickup Gacha Rerun Now Available!

Gacha

[Limited] Akari Minase Pickup Gacha Now Available!

Event

Special Event [In a Gentle Drowse] Now Available!

Event

Fierce Battle Area (Limited): Point of Reversal Now Available!

Event

Fierce Battle Area (Permanent): High-Difficulty Stages Added!

News

New Trainings: Paraves-Type Kaiju α & Mole-Type/Feet Added!

Event

Main Story Ch. 11 Release & Celebration Event

News

New Upcoming Feature: Unlock Potential!

Update

Version 1.9.0 Update Now Live

Known Issue

[Updated] Regarding Currently Confirmed Issues

Known Issue

Regarding App Instability on iOS 26.4 and iPadOS 26.4

News

New Training: Wolf-Type Kaiju α Added!

News

New Trainings: Wyvern-Type Kaiju β/Kaiju No. 6 Added!

Event

THE GAME Missions Now Available!

Event

Expedition HARD Mode Added!

Event

New Training: Fungal-Type β Added!

News

Changes to Weekly Limit and Stamina for Identified Kaiju Neutralization

News

New Shop Arrival: Defense Force Support Special Pack!

Event

New Training: Caudata-Type α Added!

Event

New Training: Armored-Type α Added!

News

PC (Steam®) Version Now Available!

Important

Official Release & Pre-Registration Rewards

News

The KAIJU NO. 8 THE GAME Web Store

News

Release Celebration Items—Value Items Now On Sale!

Event

Training: Defense Force Manual—2x Rewards Campaign Now Available!

News

Defense Force Pass Now Available!

News

Monthly Items Reset

News

[Updated] Version 1.9.1 Update Now Live

Event

Raid Battle: Kaiju No. 10 (Giant Form) HP Adjustment

Event

Mop-Up Operation Now Available!

Event

[Updated] Raid Battle: Kaiju No. 10 (Giant Form) Now Available!

Gacha

Soichiro Hoshina Pickup Gacha Now Available!

Event

Special Event [Whirlwind from the West] Now Available!

Event

Large Conquest: Invigorating Pursuit Now Available!

Gacha

Kikoru Shinomiya Pickup Gacha Rerun Now Available!

Gacha

[Limited] Akari Minase Pickup Gacha Now Available!

Event

Special Event [In a Gentle Drowse] Now Available!

Event

Fierce Battle Area (Limited): Point of Reversal Now Available!

Event

Fierce Battle Area (Permanent): High-Difficulty Stages Added!

News

New Trainings: Paraves-Type Kaiju α & Mole-Type/Feet Added!

Event

Main Story Ch. 11 Release & Celebration Event

News

New Upcoming Feature: Unlock Potential!

News

New Training: Wolf-Type Kaiju α Added!

News

New Trainings: Wyvern-Type Kaiju β/Kaiju No. 6 Added!

Event

THE GAME Missions Now Available!

Event

Expedition HARD Mode Added!

Event

New Training: Fungal-Type β Added!

News

Changes to Weekly Limit and Stamina for Identified Kaiju Neutralization

News

New Shop Arrival: Defense Force Support Special Pack!

Event

New Training: Caudata-Type α Added!

Event

New Training: Armored-Type α Added!

News

PC (Steam®) Version Now Available!

News

The KAIJU NO. 8 THE GAME Web Store

News

Release Celebration Items—Value Items Now On Sale!

Important

Account Linking Recommended

Update

Data Update & Event Preview

Update

Version 1.9.0 Update Now Live

Known Issue

[Updated] Regarding Currently Confirmed Issues

Known Issue

Regarding App Instability on iOS 26.4 and iPadOS 26.4

Important

Official Release & Pre-Registration Rewards

2026-05-30T08:40:00Z

Mop-Up Operation Now Available!

Overview

Following the defeat of Kaiju No. 10 (Giant Form), a massive swarm of Kaiju has appeared.

Commencing the Mop-Up Operation.

Earn awesome rewards by defeating the Yoju as they put up a desperate final resistance!

Availability Period

Until 2026-06-09T02:59:59Z.

*If all Kaiju are defeated during the availability period, the Mop-Up Operation will end 24 hours after the stages have concluded.

Changes Since Previous Rotation

  • Increased the amount of obtainable rewards for each stage.
  • The limit for replenishing Mop-Up Operation Permits using Dimensional Crystals has changed from no limit to 5 times per day.
  • Battles will now end automatically once you have reached the maximum obtainable rewards for each battle based on the number of Kaiju defeated.

Event Description

  • The Mop-Up Operation is a competitive event where all players work to neutralize a massive number of Kaiju.
  • The Mop-Up Operation consists of 5 stages, and you can challenge each stage until the remaining number of Kaiju reaches 0.
  • Use specific permits to take part in Mop-Up Operation.¹ ²
  • Each battle ends once 5 rounds have elapsed. Defeat as many Kaiju as possible within 5 rounds.
  • Each of the 5 stages offers different rewards.
  • The more Kaiju you defeat in a single battle, the greater the rewards you obtain.
  • In every stage, there is a rare chance to obtain ★5 Unimaterial [Ant-Type Kaiju α], which guarantees a ★5 Unipart when used during development.
  • Skipping is not available for Mop-Up Operation.
  • The event ends once the remaining number of Kaiju in all stages reaches 0.

¹ During the availability period of the Mop-Up Operation, up to 5 Mop-Up Operation Permits can be claimed on the event screen every 4:00 AM JST. If you have unused Mop-Up Operation Permits at 4:00 AM JST, you can claim new ones to reach a total of 5.

² Mop-Up Operation Permits can also be replenished up to 5 times per day using Dimensional Crystal x20. The replenish count resets daily at 4:00 AM JST.

Important

  • If a Mop-Up Operation battle ends in defeat, retreat, or suspension, rewards will still be granted based on the number of Kaiju defeated up until that point. However, Mop-Up Operation Permits will not be refunded.