Based in Tokyo
& Munakata, Fukuoka

糀屋総一朗Soichiro
Kojiya

Making places, measuring value.

Making places, measuring value

© '26
2001 — 2026
Projects0
Valuations of stock acquisition rights, convertible bonds and classes of shares500+
Rental spaces opened and operated100+
Units converted in company-owned properties500
Tokyo properties surveyed1,000+

Work01—26The work of Soichiro Kojiya, 2001–2026

Place-makingValuation & Digital
  1. 2005
    · Place-making

    Re-KnowMixed-use building · Higashi-Nihonbashi, Tokyo

    A 30-year-old former headquarters of a textile wholesaler, acquired at auction and converted into design SOHO units inspired by the New York loft. An unpopular property with a mix of freehold and leasehold land rights, revived for about half the cost of new construction and leased at roughly 1.5 times local market rents. Featured in CASA BRUTUS, Tokyo Walker and more.

  2. 20072007 —
    · Valuation & Digital

    Warrant and convertible bond valuationValuation

    Valuation of third-party allotment warrants of listed companies (such as MS warrants), stock options, convertible bonds and classes of shares. Built the Black–Scholes, binomial and Monte Carlo simulation valuation programs himself. Over 500 engagements in total.

  3. 20082008.12 — 2010
    · Valuation & Digital

    Lehman Brothers Japan — Civil Rehabilitation TeamSecondment · Cash management

    Seconded for a year and a half to the civil rehabilitation team during Lehman Brothers Japan's civil rehabilitation proceedings. On the cash management team, handled cash position management, cash flow analysis and liquidity management.

  4. 20092009 — 2016
    · Place-makingSold

    Supenavi · Kojiya Hako KikouRental space business

    Founded KIRIAGERU Inc. and launched a website and operations for finding rental spaces such as photo studios and event venues. Also launched an Osaka edition, Osaka Hako Kikou, opening and operating more than 100 spaces nationwide. Grew the business to about ¥500 million in annual sales before selling it to a subsidiary of a listed company.

  5. 2014
    · Place-making

    Kamakura N-teiPhoto studio · Kamakura, Kanagawa

    A hilltop residence overlooking the sea, operated in-house as a photo studio with a pool. Used for advertising, magazine, commercial and film shoots, with catering available from N-cafe on the grounds.

  6. 2017
    · Place-making

    BAR TAMBIBar · Ebisu, Tokyo

    A bar in Ebisu built around records and music, operated in-house and later transferred to an investor acquaintance. Also ran café and bar food-and-beverage businesses and furniture sales.

  7. 2018
    · Place-making

    Area Renovation FundRegional revitalization fund

    Formed a fund to build industries that turn a region's appeal into value, and began investing in Oshima, Munakata City, Fukuoka.

  8. 2019
    · Place-making

    VILLA MINAWAAccommodation · Munakata Oshima, Fukuoka

    A luxury villa for one group per day. Interiors, furnishings, amenities and cleaning are all crafted and run in-house. (Official site)

  9. 2022
    · Place-making

    ShimasozaiPet food brand

    Dog treats made from wild boar caught on Munakata Oshima. (Online shop)

  10. 2022
    · Place-making

    umiba / Umiba booksBookstore and shop · Munakata Oshima, Fukuoka

    A renovation of the island's former administrative center (the old village office). An island hub with a bookstore, an artists' select shop, retail and a multi-purpose rental space.

  11. 2022Oct 2022
    · Place-making

    Art fishing flag “MOVE ON”Collaboration with Mariko Iguchi · Munakata Taisha Miare Festival

    A work by Mariko Iguchi, an Oshima-based artist supported by Local Tourism's art fund Ω, turned into a 120 cm × 200 cm tairyo-bata fishing flag. Flown on the fishing boat Daini Miyaichi Maru during the Miare Festival, Munakata Taisha's maritime procession, it cruised the Genkai Sea. It was exceptional in the festival's long history for an artwork without a boat name to be used as a fishing flag. (Press release)

    © 2022 Mariko Iguchi

  12. 2024Jan 2024
    · Place-making

    Auberge Les Quatre Saisons MunakataAuberge · Akama, Munakata, Fukuoka

    Runs a French auberge in Akama, Munakata.

  13. 2024Apr 2024
    · Place-making

    OMISEYA SUNSelect shop · Munakata Oshima, Fukuoka

    Opened “Japan's hardest-to-reach select shop” on Oshima, by Takayuki Yamazaki, a former Honda hyper designer. (Instagram)

  14. 2024
    · Place-making

    MOIRAI ORGANICSCosmetics brand

    A cosmetics brand made with local ingredients, with a promise: “We only make things that are safe even if a baby kisses them.” (Official site)

  15. 2025Apr 2025
    · Place-making

    THE THERMVilla with sauna · Munakata Oshima, Fukuoka

    A villa for one group per day with a sauna and fire pit, overlooking the World Heritage island of Okinoshima. (Official site)

  16. 2025Aug 2025
    · Place-making

    SAUNA -MURO- Munakata OshimaSauna · Munakata Oshima, Fukuoka

    A wood-fired meditation sauna built facing Okinoshima.

  17. 2025Nov 2025
    · Place-making

    Zero Inn — Souda RuaInstallation video · Munakata Oshima, Fukuoka

    “Perhaps we have accumulated too much.” Zero Inn, an installation with Souda Rua celebrating becoming zero and letting go. Created on Munakata Oshima and sponsored by Local Tourism.

  18. 2026Mar 2026
    · Valuation & Digital

    FacuttoFactoring comparison site

    A comparison site that helps businesses struggling with cash flow find the factoring company that fits them. (facutto.jp)

  19. 2026Mar 2026
    · Valuation & Digital

    Stock Option Advisory ServicesAppointed Representative Director & CEO

    End-to-end support for stock options, from plan design to valuation and registration. (soas.co.jp)

  20. 2026Apr 2026
    · Valuation & Digital

    warrant pricerCalculation app

    A web app that estimates the fair value of stock acquisition rights using the Black–Scholes formula and Monte Carlo simulation. (warrant-pricer.com)

  21. 2026May 2026
    · Valuation & Digital

    CrediflowCredit risk model

    A credit risk model applying the financial engineering honed in warrant valuation to credit assessment. Led its development and is running it in live trials at Facutto.

  22. 2026Aug 2026
    · Place-making

    MINAWAAccommodation brand site · Munakata Oshima, Fukuoka

    The site for MINAWA, the accommodation brand that brings together VILLA MINAWA and THE THERM. Under the theme “Simply, there.”, it conveys the prayers, nature and daily life of the World Heritage island in Japanese, English and Korean.

  23. 2026Aug 2026
    · Valuation & Digital

    Solar Deal SearchSolar power plant transaction data

    A database for searching solar power plant transactions and the companies behind them. (sds.tokyo)

  24. 2026Sep 2026
    · Valuation & Digital

    WakettoComparison of buyers for distressed real estate

    A site for comparing buyers of distressed real estate, such as vacant houses, stigmatized properties, co-ownership shares and leasehold interests. (waketto.jp)

  25. 2026Oct 2026
    · Place-making

    Munakata Oshima PortalTravel information site

    A travel portal bringing together the sights, food, accommodation and even ferry timetables of Munakata Oshima, a World Heritage island. (Visit site)

  26. 2026Oct 2026
    · Valuation & Digital

    SecuttoSecurity comparison and consultation

    A site for finding security measures related to internal controls in the AI era, and companies you can rely on. (secutto.com)

  27. 2026Oct 2026
    · Place-making

    CYCLIC GALLERYArt leasing

    Art leasing and monthly rental, with the paintings on your walls changed every season. (Official site)

  28. 2026Nov 2026
    · Valuation & Digital

    THE FIRST 90Sleep quality information site

    “Sleep quality is decided in the first 90 minutes.” Based on research data, the site covers deep sleep, body temperature and the brain's switch, daily rhythms, timing calculators for bathing and alarms, and how to choose sleep products.

ProfileSoichiro Kojiya — Profile

Soichiro Kojiya

Soichiro Kojiya

Born in 1978 in Fukui Prefecture and raised in Hida-Takayama. Graduated from the Department of Law, Faculty of Law, Keio University, and completed the Graduate School of Finance at Waseda University.

Starting with real estate revitalization, his work has extended to rental spaces, photo studios, a bar, and inns and shops on a remote island. In parallel, he has applied the financial engineering gained from warrant valuation to credit assessment and web services. He continues both kinds of work: making places and measuring value.

Career

2001
At a real estate investment firm, handled research and conversion of auction properties
2004
At a real estate company, handled property acquisition and value-add. Created Re-Know
2007
Valued warrants and convertible bonds at an independent FAS firm
2008
From December, seconded for a year and a half to Lehman Brothers Japan's civil rehabilitation team, handling cash management
2009
Founded KIRIAGERU Inc., expanding into rental spaces, food and beverage, furniture sales and real estate investment
2016
Sold the rental space business to a subsidiary of a listed company
2018
Formed the Area Renovation Fund and began investing in Munakata Oshima
2021
Founded Local Tourism, Inc.
2025
Supported local businesses in solving challenges through Munakata City's side-job professional talent program
2026
Appointed Representative Director & CEO of Stock Option Advisory Services Co., Ltd.

Value takes place.

Available for
selected projects

Work inquiries →

Work inquiries (SOAS) Local Tourism Common Future & Co. Instagram Facebook