Quick Answer
Window status: the SmashGrow Summer 2026 event closed on September 22, 2026 11:59 JST, so its story chapters, Marine Slime tickets, Watermelon Defense multi, and King Suika Rock Shrine are no longer farmable unless the event returns. This page stays up as a record of the run and as preparation for a rerun.
Use the current event checklist for today’s short action order, and this page when the question is the Summer 2026 event route, Marine Slime farming, watermelon cooking, the Swimsuit ‘26 banner, or the event limited Memories.
Event Window and Schedule
The Summer 2026 event opened on August 18, 2026. The live window is reported through about September 22, 2026 11:59 JST; always confirm the exact end on the in-game timer before last-day spending.
| Window | Content |
|---|---|
| Aug 18 | Event start, story chapter 1, Marine Slime strong enemy, Swimsuit ‘26 banner |
| Aug 25 | Story chapter 2, multi quest Watermelon Defense (Masked Great-Hammer boss) |
| Sep 1 | Story chapter 3, shrine quest “King Watermelon Rock” |
| Sep 8 | Story epilogue |
The schedule is planned content and can shift. Check the live event screen for the current chapter and unlocked quests.
What to Do First
Run this order so free tickets and limited rewards are not left sitting:
- Clear the event story chapters you can handle and collect Broken Watermelon.
- Cook watermelon dishes to unlock the event adventure skills.
- Run the Marine Slime strong enemy for cumulative point and gacha ticket rewards.
- Run the Watermelon Defense multi quest for Masked Great-Hammer Memory and multi point rewards once chapter 2 is open.
- Exchange Watermelon Seeds for limited items, tickets, and event accessories.
- Check the Swimsuit ‘26 banner only after free tickets and event checks are planned.
Watermelon Cooking and Event Skills
Event stages spawn Watermelon Rock enemies. Defeat them to collect Broken Watermelon, which is the material for watermelon dishes. Cooking unlocks event-limited adventure skills (such as a salted watermelon soda skill) that make the event dungeons easier to clear.
Farming Broken Watermelon first, then cooking, then running the strong enemy and multi quests is the efficient loop for the window.
Marine Slime Strong Enemy
The Marine Slime strong enemy opens with the event start and is a cumulative-point target. Its reward track includes gacha tickets for the Swimsuit ‘26 banner, so it is a high-priority repeat while the window is open. Use the event cooking skills and wind or water coverage against the fight, and stop when the points and tickets you need are claimed.
Watermelon Defense Multi Quest
The Watermelon Defense multi quest opens with the Summer 2026 chapter 2 wave around August 25, 2026. You defend the large watermelon from the Masked Great-Hammer boss, which is weak to wind (super) and ice and fire.
Bring wind weapons to hit the boss and most enemies for super weakness, or ice as a secondary. Prioritize ball- and arrow-type adventure skills such as Wind Ball and Hyado Arrow, and use the Watermelon Rock explosions to stagger the boss. You clear by defeating the boss or surviving the timer and keeping the large watermelon safe. The reward track includes the Masked Great-Hammer Memory and multi point rewards.
Open the full Watermelon Defense guide for the unlock, weakness chart, recommended builds, and stop lines.
King Suika Rock Shrine
The King Suika Rock Shrine opens with the Summer 2026 chapter 3 wave around September 1, 2026. It is a shrine quest against the plant-family King Suika Rock, which is weak to wind.
Lead with wind weapons, prioritize ball-type adventure skills for the +50% damage challenge rule, and use the Watermelon Rock explosions to break the boss’s shield. The reward track includes the King Suika Rock Memory and shrine medals.
Open the full King Suika Rock Shrine guide for the unlock, weakness chart, recommended builds, and stop lines.
Swimsuit ‘26 Banner and Sea Storm Staff
The Swimsuit ‘26 banner runs alongside the event (reported from August 18, 2026 through about September 29, 2026 11:59 JST; confirm in-game). Its headline is the new Sea Storm Staff, a 3-star wind-element staff. Its special pulls nearby enemies toward the highest-HP target and deals wind spell damage, which is strong for multi-enemy content such as Super Monster Rush. The banner also carries swimsuit armor pieces.
Pull decision details and stop lines live on the current banner guide. This page keeps the event-side context.
Exchange Shop
Spend Watermelon Seeds on limited tickets, event accessories, and other window items before filler. Gacha tickets can come from both the strong enemy cumulative rewards and the seed exchange, so plan both paths before pulling. Use the exchange shop guide for the general currency check order.
Limited Memories
The Summer 2026 event adds limited Memories such as Marine Slime, Watermelon Rock, Masked Great-Hammer, and King Suika Rock. Pick these up from the event story, strong enemy, multi quest, and shrine windows while they are live, and compare their slot value on the best Memories tier list before upgrading. The Masked Great-Hammer Memory comes from the Watermelon Defense multi quest as a purple spell-oriented piece, while the King Suika Rock Memory comes from the King Suika Rock Shrine as a purple wind spell piece with a Bagi Ball opening skill.
Stop Lines
- Stop repeating the Marine Slime strong enemy once the ticket track and points you need are claimed.
- Stop repeating Watermelon Defense once the Masked Great-Hammer Memory quality and point rewards you need are secured.
- Stop deep-farming Watermelon Rock spawns once your cooking skills are unlocked and the exchange targets are bought.
- Do not plan new pulls on the Swimsuit ‘26 banner until free tickets and the event checks above are done.
- Volatile timing can change. Follow the in-game timer for exact end times and unlock windows.
Related Reads
| Page | Use it for |
|---|---|
| Current Event Checklist | Today’s short action order across all live content |
| Watermelon Defense Multi Quest | The chapter 2 multi unlock, weakness chart, and builds |
| King Suika Rock Shrine | The chapter 3 shrine unlock, weakness chart, and builds |
| Masked Great-Hammer Memory | Exact stats, keep or skip, and upgrade advice |
| Current Banner Guide | Swimsuit ‘26 pull/save and stop-line decisions |
| Sea Storm Staff | Weapon data, stats, skills, and acquisition notes |
| DQ6 Event Checklist | The parallel DQ6 collaboration route |
| Exchange Shop Guide | Event currency and exchange check order |
FAQ
When does the SmashGrow Summer 2026 event run?
The SmashGrow Summer 2026 event started on August 18, 2026. The live window is reported through about September 22, 2026 11:59 JST; confirm the exact end time on the in-game timer before last-day calls.
What is the headline weapon in the Swimsuit '26 banner?
The Swimsuit '26 banner is headed by Sea Storm Staff, a 3-star wind-element staff whose special pulls nearby enemies and deals wind spell damage. It is strong for multi-enemy content such as Super Monster Rush. Confirm the live pool, rates, and English display name in-game.
What should I do first in the Summer 2026 event?
Clear the event story to collect Broken Watermelon, cook dishes to unlock event adventure skills, run the Marine Slime strong enemy for cumulative ticket rewards, and exchange Watermelon Seeds before deep farming one boss.
Are there limited Memories in the Summer event?
Yes. The Summer 2026 event includes limited Memories such as the Marine Slime and Watermelon Rock memories. Collect them from the event story and strong enemy windows before the event ends.