Hotori is the S-Rank Cosmos sub-DPS launching on the rate-up banner in Neverness to Everness, and taking her from Lv.1 to fully ascended with maxed skills requires a fixed pool of farmable items. The list spans an anomaly boss drop, three tiers of Whisper monster drops, a weekly boss material, Esper Ability books, and a large Beetle Coin reserve.
Quick answer: Pre-farm Confessional Flower Seed (Serenetti anomaly), Lost / Obscure / Paradoxical Whispers (common-world enemies), Dress Sleeves of Vanity (weekly boss), The Olive Branch, Dove's Flutter, and Nestling's Longing (Houdinii's Schemes), plus roughly 2.27 million Beetle Coins.
Hotori total material cost (Lv.1 to max, skills maxed)
The figures below cover taking Hotori to her maximum level cap through all six ascensions and raising every active skill to its top rank. Numbers are the cumulative totals, not per-tier costs.
| Material | Total required | Purpose |
|---|---|---|
| Confessional Flower Seed | 86 | Ascension (boss drop) |
| Lost Whispers | 57 | Ascension (low tier) |
| Obscure Whispers | 68 | Ascension (mid tier) |
| Paradoxical Whispers | 79 | Ascension (high tier) |
| Beetle Coin | 2,273,000 | Ascension and skill upgrades |
| Dress Sleeves of Vanity | 32 | Skill upgrades (weekly drop) |
| The Olive Branch | 64 | Skill upgrades (Esper Ability book) |
| Dove's Flutter | 40 | Skill upgrades (Esper Ability book) |
| Nestling's Longing | 40 | Skill upgrades (Esper Ability book) |
Hunter Rank 10 is the gate for the first ascension. Even with every material stockpiled, the ascension menu stays locked until your account hits that rank, so push exploration and main missions before her banner opens.
Confessional Flower Seed - anomaly boss drop
Confessional Flower Seed is the unique ascension item tied to Hotori. It drops from the Anomaly Hunt "Serenetti", a manor-based boss fight on the world map. Each challenge costs 60 Pixels of stamina, and the drop is shared with Skia, so plan resin carefully if you are also building that character.

Material Selection Boxes from events and the Hunter Exchange can substitute Confessional Flower Seed when the boss schedule is inconvenient.
Whisper series - common enemy drops
The three Whisper tiers all come from the same pool of regular world enemies, but only the lowest tier drops directly. Higher tiers are crafted by combining lower-tier Whispers, or pulled from the Anomaly Drop pool, Hunter Exchange, or Lost Exchange.

| Whisper tier | Primary source | Used by |
|---|---|---|
| Lost Whispers | World enemy drops, Material Selection Box, Hunter Exchange, Lost Exchange | Hotori, Chiz, Esper Zero, Edgar |
| Obscure Whispers | Anomaly Drops, crafting from Lost Whispers, Hunter Exchange, Lost Exchange | Hotori, Chiz, Esper Zero, Edgar |
| Paradoxical Whispers | Anomaly Drops, crafting from Obscure Whispers, Hunter Exchange | Hotori, Chiz, Esper Zero, Edgar |
Note: Whisper drops are shared with the Cosmos roster, so any leftover stock from Chiz, Esper Zero, or Edgar will count toward Hotori's totals.
Dress Sleeves of Vanity - skill upgrade material
Dress Sleeves of Vanity is the weekly boss drop tied to Hotori's skill upgrades. Save weekly boss challenges that drop this item until her banner goes live if you do not need the material for another character.
Esper Ability books from Houdinii's Schemes
The Olive Branch, Dove's Flutter, and Nestling's Longing all fall into the Esper Ability progression category and feed Hotori's skill levels. The primary sources are the Houdinii's Schemes domain rotation, the Hunter Exchange, and crafting from lower-tier variants.

Tip: Houdinii's Schemes rotates which books are available on specific days. Check the in-game schedule and run the days that drop these three items rather than mixing in books you do not need.
Beetle Coin requirements
Beetle Coin is the standard upgrade currency in NTE and the largest numerical cost on Hotori's list at roughly 2.27 million. It comes from world exploration, Houdinii's Magic Stage, Material Selection Boxes, and the Hunter Exchange. The most efficient sources are open-world chests and exploration nodes you may not have cleared yet, so finish region completion before her banner if your Beetle Coin reserve is below the target.
Pre-farm priority order
Step 1: Stockpile Confessional Flower Seed from Serenetti. The drop is rate-limited by stamina, so this is the slowest item to accumulate and should start first.
Step 2: Farm common-world enemies for Lost Whispers and let Obscure / Paradoxical Whispers come from Anomaly Drops or crafting. Do not spend Hunter Exchange currency on Whispers unless you are short on the top tier near the end of farming.
Step 3: Reserve weekly boss challenges that yield Dress Sleeves of Vanity. Hold these slots open across the weeks leading up to her banner.
Step 4: Run Houdinii's Schemes on the rotation days that drop The Olive Branch, Dove's Flutter, and Nestling's Longing. Convert excess lower-tier books upward through crafting rather than holding low-rarity duplicates.
Step 5: Clear remaining open-world regions to top up Beetle Coin and Character EXP through Hunter Guides. Aim for a reserve well above 2.27 million Beetle Coin so you have headroom for her weapon and Arc upgrades.

Verifying ascension is unlocked
You will know Hotori can ascend when the ascension prompt appears on her character screen with a usable confirm button rather than a greyed-out lock icon. If the button stays locked despite holding every material, your Hunter Rank is still below 10 - finish exploration tasks and Anomaly Commissions to raise it.
The level cap raises in steps of 10 after each ascension, and the character's portrait frame updates to reflect the new tier. Skill upgrades are confirmed in the skill menu when each node's level number ticks up after spending Beetle Coin and the relevant books.
Hotori shares her ascension boss with Skia and her Whisper line with three other Cosmos units, so any pre-farming you do now carries over even if her banner timing or roster shifts. Lock in Confessional Flower Seed runs first, keep Beetle Coin flowing from exploration, and the rest of the list catches up through normal weekly play.