Volume 1: The Birth of the Abyss Bat**.
---
# **Wings of Eternity**
Ethan Cruz, 24, a hardworking yet unremarkable man from Earth, dies in a tragic traffic accident. He recalls his unfulfilled dreams as everything fades.
* **Transition:** A mysterious voice speaks, "Your will to survive has been noted."
* **Rebirth:** He awakens in darkness, upside down, realizing he has a new body—wings, claws, and heightened hearing.
* **Shock:** At first, he thinks it's a nightmare, but the **System** boots up.
* **System Window:**
```
[Species: Cave Bat (Rank F)]
HP: 10 | MP: 3 | Stamina: 8
Skills: Echolocation (Lv.1), Bite (Lv.1)
Title: Otherworldly Soul
```
* **Ending Hook:** Panic sets in—he's reborn as a **bat** in a monster-infested cave.
---
### **Chapter 2: First Hunt**
* **Conflict:** His instincts scream for blood. He joins the colony in their nightly flight, struggling to keep up.
* **Encounter:** Spots his first prey—a rabbit. He hesitates, disgusted by the idea of drinking blood.
* **Survival Instinct:** A wildcat appears, forcing Ethan to fight or die. Desperation pushes him to use Bite.
* **System Update:**
```
[Skill Gained: Blood Drain (Lv.1)]
[Level Up!]
```
* **Character Beat:** Ethan is horrified yet exhilarated. He resolves: *If I must live as a bat, then I'll survive, no matter the cost.*
---
### **Chapter 3: Predators in the Dark**
* **Escalation:** An owl hunts him. During the chase, he uses Echolocation to escape through narrow crevices.
* **Near-Death:** He's badly injured, his HP almost reaching zero. The System activates emergency protocol.
* **System Window:**
```
[Skill Unlocked: Survival Instinct (Passive)]
Effect: Boosts reaction speed and awareness under life-threatening danger.
```
* **Ending Hook:** Ethan realizes every life-or-death battle makes him evolve.
---
### **Chapter 4: The Blood Pact**
* **Development:** Ethan experiments with Blood Drain, discovering he absorbs not only vitality but fragments of his prey's abilities.
* **Mechanic Discovery:**
* Drinking from a rabbit = slight boost in agility.
* Drinking from a wolf pup (risky) = minor boost in strength.
* **Character Growth:** He begins strategizing hunts, no longer just reacting.
* **Foreshadowing:** Hints of a deeper connection between his soul and the System.
---
### **Chapter 5: Whispers of Magic**
* **Event:** While exploring deeper caves, Ethan hears a strange **resonance**—like a hum in his bones.
* **Discovery:** A faint glowing crystal pulsates with mana.
* **System Alert:**
```
[Mana Core Detected]
[Skill Learned: Mana Sense (Lv.1)]
```
* **Character Beat:** Ethan realizes he's not limited to being a mindless beast—he can wield **magic**.
* **Cliffhanger:** A massive snake beast appears, drawn to the mana crystal.
---
### **Chapter 6: The Serpent of Shadows**
* **Major Battle:** Ethan faces the cavern's apex predator, a Rank E Shadow Serpent.
* **Struggle:** He uses echolocation, darting strikes, and desperate blood drains. His Survival Instinct keeps him alive by split seconds.
* **Climax:** Biting into the serpent's mana-rich flesh, Ethan gains a surge of foreign energy.
* **Victory:** The serpent dies after a grueling battle.
* **System Update:**
```
[Species Evolution Possible!]
[Choose Evolution Path]
- Lesser Night Bat (Agility-focused)
- Mana Bat (Magic-focused)
- Bloodfang Bat (Predatory-focused)
```
* **Ending Hook:** Ethan must choose how he'll shape his new destiny.
---
### **Chapter 7: Evolution**
* **Choice:** He selects **Mana Bat**, craving control over magic.
* **Transformation Scene:** His body reshapes, wings infused with faint glowing runes, eyes burning with eerie intelligence.
* **System Window:**
```
[Species: Mana Bat (Rank E)]
HP: 25 | MP: 40 | Stamina: 18
Skills: Echolocation (Lv.2), Blood Drain (Lv.2), Mana Sense (Lv.2), Shadow Veil (Lv.1)
Title: Evolving Predator
```
* **Character Reflection:** Ethan feels less beast, more… something greater.
* **Foreshadowing:** He dreams of a silver-haired girl calling his name.
---
### **Chapter 8: The Maiden of the Silver Moon**
* **Event:** While hunting above ground, Ethan finds a gravely wounded girl in a clearing, surrounded by wolf beasts.
* **Dilemma:** Instinct says flee. Humanity says protect.
* **Action:** He attacks the wolves with newfound magic—using Shadow Veil to disorient and Blood Drain for strength.
* **Outcome:** Together, they survive. The girl whispers, "Thank you…" before collapsing.
* **System Alert:**
```
[New Quest: Protect the Maiden of the Silver Moon]
Reward: Unknown
```
* **Ending Hook:** For the first time, Ethan has someone to fight for beyond himself.
---
### **Chapter 9: Bonds in the Moonlight**
* **Scene:** Ethan watches over the unconscious girl.
* **Internal Conflict:** Can a human and a bat truly form a bond? Will she fear him if she wakes?
* **Flashback:** Memories of his human life remind him of loneliness and lost chances.
* **Decision:** He vows silently—*I will survive, grow, and protect her.*
* **Cliffhanger:** Strange figures cloaked in black approach the clearing, searching for the girl.