Side Road 4 is the ninth individual Drama CD released, and the first featuring only the Hakone Academy Bicycle Club.


1. Detective, Shinkai Hayato. Assistant, Arakita Yasutomo. Once Again!
2. Manami's Worries
3. Detective, Shinkai Hayato. Client, Izumida Touichirou.
4. The Greatest Battle Of All In Hakone?
5. Detective, Manami Sangaku. Assistant, Arakita Yasutomo. (Assumed)
6. An Unforgettable Day
7. Detective, Arakita Yasutomo. Criminal, Shinkai Hayato.
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