Arknights "Yesterday's Sea" Shop Exchange Priority and October Schedule: A Sanity Plan
Applicable version: as of the 2026-10-09 update (this title has no version numbers, so the official announcement date is the time anchor)
Arknights Yesterday's Sea at a glance: opens October 9, runs 21 days
arknights guide,Yesterday's Sea opens 2026-10-09 12:00 and ends 2026-10-30 03:59, and you need to clear Main Story 1-10 to unlock it. It is a limited-time SideStory rather than a permanent Intermezzi, so the shop closes with the event and the event currency does not carry over.
Schedule and unlock requirement
The window spans 21 days. Shop stock splits into one-time purchases and repeatable ones, and only the one-time stock drives the priority order.
How the three October events stack up
Per the published schedule, the mid-October National Library collab "Hengyuan Jinliang" hands out event furniture through login check-ins; late October brings "Visual Museum: Evolution"; and Integrated Strategies gets another "Sunken Ones' Black Current Tree Sea" content expansion . Three items share one window, which means sanity has to be split in advance.
Arknights Yesterday's Sea shop priority: the four-tier order
There is exactly one rule: grab the limited, non-replaceable items first, then backfill the common materials you can farm any time.
Tier 1: event operator tokens and limited furniture
The listed rewards include the event operator [5-star Lyugu], the [Harbor Lounge] furniture set (partly), module materials, and the "Future-Sight Mirror". Lyugu is a 5-star Alchemist Specialist that the official notes confirm is obtainable only during this event, so its token slot comes first.
Tier 2: module materials and the Future-Sight Mirror
Module materials and the Future-Sight Mirror are core progression currency with broad use, but you can still top them up through permanent content after the event. They sit behind operator tokens only because they have a fallback route, and Lyugu does not.
Tier 3: common materials and LMD
LMD and EXP cards are farmable in resource stages whenever you like. They go last not because they are useless but because they are always available, so the limited event currency should go to slots you can never reacquire.
Arknights Yesterday's Sea tokens and stage unlock rhythm
Event currency only drops in event stages, and how much you get depends on which stage you run and whether it has unlocked.
Two-stage unlock: Rea-Iberia and Our Iberia
The event splits into two stage groups: "Rea-Iberia" runs 2026-10-09 12:00 to 2026-10-23 03:59, and "Our Iberia" runs 2026-10-16 16:00 to 2026-10-23 03:59. The second group opens 7 days later, so between October 9 and 16 you can only farm the first group.
Token farming and sanity potion timing
We treat the first week as first-clear only, no grinding, because first-clear rewards are fixed while token drops are random: bank the certain payout before farming the odds (reasoning from standard event mechanics). At 240 sanity per day, 21 days is about 5,040 sanity; if the second group's drop rate is better, the potions you stockpiled in week one belong after October 16.
Arknights October sanity schedule: three events plus one roguelike
Splitting the 21 days into three blocks is steadier than farming at random. The table below assumes 240 sanity per day from natural regen.
| Window | Focus | Sanity goes to | Note |
|---|---|---|---|
| Oct 09 - Oct 15 | Yesterday's Sea, group 1 | Main-story first clears + low-tier shop | Certain rewards only |
| Oct 16 - Oct 23 | Yesterday's Sea, group 2 + Hengyuan Jinliang | Token top-ups + collab check-in | Collab is login-only |
| Oct 24 - Oct 30 | Yesterday's Sea wrap-up + Visual Museum: Evolution | Clear tokens + open the new event | Keep a top-up buffer |
When to slot in the Hengyuan Jinliang collab
Hengyuan Jinliang is a login check-in collab that does not consume sanity. We place it after October 16 because the second stage group opens the same day, and sanity should still go to Yesterday's Sea token top-ups first.
Visual Museum: Evolution and the Black Current Tree Sea expansion
Late October's "Visual Museum: Evolution" and the Integrated Strategies "Sunken Ones' Black Current Tree Sea" expansion (new endings, stages, and squads) are both new content . Integrated Strategies costs time rather than sanity, so it does not clash with the Yesterday's Sea wrap-up.
Arknights Yesterday's Sea hands-on trade-offs
The sections above give the order; this one gives the timing.
Why limited items go first
The most common way to lose value in practice is converting tokens into LMD early, then discovering the limited furniture is half-bought at the end. Limited items get one chance and common materials can be farmed any time, so that asymmetry is the whole reason for the order.
When to spend sanity potions
Do not burn your sanity potions on day one. After "Our Iberia" opens on October 16, if the drop rate beats the first group, the potions you saved go into the more efficient block . Once both stage groups close on October 23, clear your tokens instead of hoarding potions.
Arknights Yesterday's Sea FAQ
When does Yesterday's Sea end, and does the shop close with it?
A：The event ends 2026-10-30 03:59; the shop closes with it and tokens do not carry over.
What should I buy first in the shop?
A：The one-time operator token (Lyugu) and the limited [Harbor Lounge] furniture first, since both are unrefillable.
How much sanity does Yesterday's Sea give me?
A：About 5,040 sanity over 21 days at 240 per day; only about 1,680 is available before the October 16 second-group unlock .
Does the Hengyuan Jinliang collab cost sanity?
A：No. It hands out furniture through 7 days of login check-ins, which is 0-sanity content .
Does the Integrated Strategies expansion clash with Yesterday's Sea?
A：No. The expansion costs time rather than sanity, so it fits into the gaps after October 24 .
Arknights Yesterday's Sea action checklist
- On launch day (October 9), first-clear the "Rea-Iberia" main stages only, for fixed rewards.
- Buy in the order operator token, limited furniture, module materials, common mats, with LMD last.
- Save sanity potions before the October 16 second-group unlock; do not spend them in week one.
- From October 16, run two tracks at once: token top-ups plus Hengyuan Jinliang login check-ins.
- After stages close on October 23, clear remaining tokens, and confirm the shop is empty before October 30 03:59.
Game Guides
- Palworld 1.0.5 Material Farming and Base Speed: The Build Chain After Ancient Bark Lv.1
Palworld 1.0.5 material farming and base speed-up. The guide reverses the build chain, covering the Ancient Bark stump route, Chromite and Hexolite Quartz prospecting, a three-crew base split, and a material back-calculation table.
- Reverse: 1999 4.0 Progression Order and Artificial Somnambulism Full Stars
Reverse: 1999 4.0.0 "The Doorward" launched on 2026-09-24. This guide covers the 4.0 progression order and resource split, plus Artificial Somnambulism (Deep Sleep and Dream domains) full-star teams and turn pacing.
- Love and Deepspace October Wish Pull Plan: Diamond Budget and Card Priority
Love and Deepspace October pull plan: the "Continuing the Year with Radiance" order by deadline, self-pick 5-star, shared double pity, and three diamond tiers.
- Honkai: Star Rail 4.6 Pearl Build Guide: Elation Team Sustain, Relics and Speed Tuning
Version 4.6, "Before the Moon Rises, Dance With Beasts", went live on 28 September 2026. Pearl is the first dedicated sustain for the Elation archetype. This guide covers her role, the signature cone and its substitutes, the Eagle set against the new 4.6 Elation set, the 162 and 187 speed thresholds, her material counts, and the standard Elation line-up.
- Genshin Impact 7.1 Skirk Build Guide: Deep Gallery Finale Artifacts, Azure Radiance and Cryo-Hydro Teams
Genshin Impact 7.1 "Requiem for the Realm of the Dead" Skirk build guide. It covers the normal-attack versus burst playstyle split, four-piece Deep Gallery Finale against Marechaussee Hunter, main and sub stat priorities, the signature weapon Azure Radiance and four-star substitutes, plus the Fissure-of-the-Void rotation and Cryo-Hydro teams.
- Wuthering Waves 3.7 Hsin (Heart) Build: Echoes, Weapon and Tower of Adversity Teams
Wuthering Waves updated to 3.7 on 2026-09-30. The new 5-star Resonator Hsin (Heart) is an Electro Rectifier damage dealer whose damage rides on Resonance Skill, split between Unison and Electro-Flare modes. This guide covers the 4-3-3-1-1 Heart of Sworn Vigil setup, main and sub stats, Blooming Jadehaven versus budget weapons, skill priority and Resonance Chains, plus two Tower of Adversity teams (values are subject to the official announcement).
- Zenless Zone Zero 3.2 Drive Discs and Shiyu Defense: Claret Flint
Zenless Zone Zero 3.2 drive disc picks and Shiyu Defense full-star teams. Version 3.2, Her Secret Past, went live on 2026-09-09; this guide covers how the 4+2 split works, why crit rate leads the substat order, how to gear DEF-scaling Claret Flint, and how to split three Shiyu Defense rooms by element.
- Palworld 1.0.5 Tower Boss Guide: Tower Order, Awakening and Breeding for Combat
Palworld 1.0.5 tower boss guide. This covers the current version and the official data path, tower order and levels, why tower bosses cannot be caught, the Awakening ceiling, combat passive priorities, and the Breeding Power Value formula with cake bonuses for fast combat-ready Pals.