Yumemizuki Mizuki’s Story Quest, “Dream Eater’s Melancholia,” is Tapirus Somniator Chapter: Act I in Genshin Impact 5.4, set back in Inazuma and centered on her dream‑therapy work at Aisa Bathhouse. You unlock it at Adventure Rank 40 after finishing the Inazuma Archon quest “Omnipresence Over Mortals” and Raiden Shogun’s second Story Quest, “Transient Dreams.” Once it’s available, you can start it directly from the Story Quest screen without spending Story Keys from Version 5.4 onward.
| Segment name | What you do in it (short) |
|---|---|
| Encounter in the Realm of Dreams | Meet Mizuki on Narukami, first therapy at Aisa Bathhouse. |
| Crisis at the Aisa Bathhouse | Investigate Emura Ichigensai and the rival bathhouse. |
| A Deceit Called Happiness | Check on sick attendants, visit Yae Miko, learn about Emura. |
| Descendant of Nightmares | Domain in Emura’s house, chase and defeat Kuroyume. |
The quest follows the Traveler and Paimon as they meet Mizuki on Narukami Island, help her save Aisa Bathhouse from a rival, and dive into a dream‑domain to confront the nightmare entity Kuroyume. If you just want to clear it quickly, you’ll talk to Mizuki in Inazuma, complete a short therapy minigame, investigate Emura Ichigensai and his rival bathhouse, then run a domain where you use Mizuki’s trial character to cross gaps, avoid Kuroyume’s gaze, and finish with a boss fight.
Quick Steps: How to Complete Dream Eater’s Melancholia
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Unlock the quest at AR 40 after “Omnipresence Over Mortals” and Raiden’s Act II, then select Tapirus Somniator Chapter: Act I from the Story Quest menu.
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Go to Narukami Island, follow the youkai to Mizuki, then head to Aisa Bathhouse and finish her first therapy session (nodding, painting minigame, hand‑holding prompt).
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Investigate the rival bathhouse with Umihiko and Susukida, then return to Aisa Bathhouse to finish the “Crisis at the Aisa Bathhouse” segment.
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Wait until 08:00–12:00, check on the sick attendants, revisit the rival bathhouse, and then speak to Yae Miko for information on Emura Ichigensai.
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Enter Emura Ichigensai’s house domain, use trial Mizuki’s skill to cross gaps, avoid Kuroyume’s line of sight, collect the Resonance of Sweet Dreams, and defeat Kuroyume.
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Wait until 06:00, return to Aisa Bathhouse, and talk to Mizuki one last time to complete the quest and claim rewards like Primogems, Hero’s Wit, and Mora.
How to Unlock Mizuki’s Story Quest
To unlock “Dream Eater’s Melancholia,” you need to meet both Adventure Rank and story requirements.
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Game: Genshin Impact, Version 5.4.
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Region: Inazuma (Narukami Island and surroundings).
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Adventure Rank: 40 or higher.
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Required Archon Quest: Chapter II: Act III – “Omnipresence Over Mortals.”
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Required Story Quest: Raiden Shogun, Imperatrix Umbrosa Chapter: Act II – “Transient Dreams.”
From Version 5.4, HoYoverse removed Story Keys as the gate for new Story Quests, so Mizuki’s chapter appears automatically once you meet the above conditions. You can then open the Story Quest menu, choose Tapirus Somniator Chapter: Act I, and accept the quest.
Walkthrough: Encounter in the Realm of Dreams
You kick things off on Narukami Island.
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Track the quest, then follow the marker to find a small youkai; follow it to Mizuki.
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After the cutscene, head with her to Aisa Bathhouse and talk to Aikawa Susumu at the entrance.
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Inside, speak with Mizuki and follow her to the therapy room, then sit on the stool when prompted.
The therapy minigame has a few simple mechanics:
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Move your camera up and down to nod when Mizuki asks you to respond.
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When she asks you to close your eyes, you can keep them closed or open them early; this only changes some lines, not progression.
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When the painting appears, you must locate three hidden youkai by moving the cursor and interacting with them.
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Finally, press your Normal Attack button when prompted to “hold Mizuki’s hand,” which ends the session and returns you to the waking world.
This first act mainly introduces Mizuki, her dream‑therapy style, and the idea that something is wrong with people’s dreams in Inazuma.
Expert insight: this opening is very forgiving, so you don’t need to stress about choice‑locking anything here; your main goal is to experience the dialogue and get comfortable with the dream framing.
Crisis at the Aisa Bathhouse and A Deceit Called Happiness
After the first session, the quest turns to the business and social side of Aisa Bathhouse.
You’ll be asked to:
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Visit the location tied to Emura Ichigensai and his competing bathhouse.
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Talk to Umihiko and Susukida to hear their side of the story and see how the rivalry affects Aisa.
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Wait your turn there, triggering a short sequence that shows how dreams and expectations are being manipulated.
Then you return to Aisa Bathhouse to debrief with Mizuki and advance time. Setting the clock between 08:00 and 12:00 reveals that some attendants have fallen ill, and you’re sent back to the rival bathhouse to learn more.
From there, the story pushes you up to Yae Miko at Grand Narukami Shrine (or the marked shrine location). She fills in details about Emura Ichigensai and the deeper cause behind the nightmares, and points you toward his residence as the next step.
These middle acts are straightforward: you mostly follow markers, talk to key NPCs, and use the in‑game clock when asked. The main way you can slow yourself down here is by forgetting to advance time after a dialogue prompt.
Descendant of Nightmares: Domain Tips and Tricks
The main gameplay challenge comes from the domain in Emura Ichigensai’s residence.
Getting through the domain
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Enter the marked house and interact to start the instance.
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Proceed along the corridors, clearing standard enemy packs until Emura appears and Kuroyume is revealed as the real threat.
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From this point, you follow Kuroyume deeper into the domain through several platforming and stealth sections.
You get access to a trial version of Mizuki, which is important for traversal.
Using trial Mizuki’s skill
Her Elemental Skill lets her float forward in a dreamlike glide.
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When you see wide gaps, switch to Mizuki and use her Elemental Skill to cross.
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Press the skill again (or cancel appropriately) once you’re above the landing platform so you don’t overshoot.
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Repeat this on several gaps; the game clearly telegraphs where you need to use her.
If you’re a newer player, this section is where you might fail a couple of times, but there’s no penalty beyond restarting the segment.
Avoiding Kuroyume’s line of sight
One of the later rooms forces you to sneak past Kuroyume while staying out of its direct gaze.
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Use walls and barriers as cover, moving from one to the next when Kuroyume looks away.
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Mix in Mizuki’s Elemental Skill for short jumps between platforms while staying behind obstacles.
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If you get caught, you’ll simply need to reposition and try again.
You also need to interact with two “Resonance of Sweet Dreams” points along the route. These are highlighted interactables on your path; activating both lets you progress to the final arena.
Final fight: how to handle Kuroyume
The last section is a standard combat encounter with some build‑up:
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You first defeat waves of enemies that spawn before Kuroyume.
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After that, Kuroyume itself becomes targetable, and you’re prompted to focus on it using the Traveler.
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Normal Story‑Quest combat rules apply: there’s no special failure condition beyond getting knocked out, and you can use your usual team around the trial character.
