Challenge Overview
The goal of this challenge was to identify the nearest Tokyo Metro station to the workplace of the target, “Lilica”. We were provided with:
- Her X (Twitter) handle: @twilight_lilica
- Her real name: Shiharu Nanaogi
- A photo from her account
- Metadata from an .fbx file
Initial Assumptions
- OSINT is key: Correlate her online identity with physical locations.
- Object Identification: Visual clues in the photo may indicate her employer.
- Strict Station Naming: Only a Tokyo Metro station should be selected; JR and private lines (like Tokyu) must be excluded.
Investigation Process
Step 1: Analyzing the Image (The Physical Clue)
- Observed the image posted at a restaurant (identified as Denny’s based on aesthetics).
- Noticed a jacket draped over a chair.
- The label on the collar read “POLEWARDS”.
- Research revealed POLEWARDS is a brand owned and manufactured by Zanter Co., Ltd. (ザンター). Reference
Step 2: Analyzing Digital Footprints (The Profession)
- File path from her computer:
\Users\shiharu_nanaogi\Documents\modeling\vrc_test\hair_pin\simple_hair_pin.fbx- Inference: She is a 3D Designer, creating VRChat assets.
- Website confirmation: twilight-lilica.com shows she is a Freelance Designer focusing on 3DCG.
- Connecting the dots: A 3D Designer with a POLEWARDS jacket likely works at Zanter Co., Ltd. (possibly in digital fashion/marketing).
Step 3: Geolocation of the Workplace
- Company: Zanter Co., Ltd.
- Address: Japan, 〒153-0042 Tokyo, Meguro City, Aobadai, 4 Chome−7−1 4F
Step 4: Determining the Station
- Candidate A: Ikejiri-Ohashi Station (~600m) — closest physically but Tokyu Den-en-toshi Line (rejected).
- Candidate B: Shibuya Station (~1.1km) — major hub, walking distance longer.
- Candidate C: Naka-meguro Station (~1.1km) — terminus of Tokyo Metro Hibiya Line, located in the same ward (Meguro-ku).
Key Findings
- Target Brand: POLEWARDS (owned by Zanter)
- Workplace: Zanter Co., Ltd. Headquarters
- Location: Aobadai, Meguro-ku
- Nearest Metro Station: Naka-meguro Station (Hibiya Line)
Final Flag / Answer
SWIMMER{中目黒}Notes & Takeaways
- Brand Reconnaissance: Clothing items and brands often provide direct links to the target’s employer.
- File Metadata: File paths, like
vrc_test, reveal the type of designer she is. - Train Line Specificity: In Japan-based CTFs, distinguish between JR, Private Railways (Tokyu, Odakyu), and Tokyo Metro. The nearest station must meet the line requirement, not just physical proximity.