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

Tracks

1. Detective, Shinkai Hayato. Assistant, Arakita Yasutomo. Once Again!
(探偵、新開隼人。助手、荒北靖友。再び!)
2. Manami's Worries
(真波の悩み)
3. Detective, Shinkai Hayato. Client, Izumida Touichirou.
(名探偵、新開隼人。依頼人、泉田塔一郎。)
4. The Greatest Battle Of All In Hakone?
(箱根学園(ハコガク)きっての名勝負?)
5. Detective, Manami Sangaku. Assistant, Arakita Yasutomo. (Assumed)
(探偵、真波山岳。助手、荒北靖友(仮)。)
6. An Unforgettable Day
(忘れられない日)
7. Detective, Arakita Yasutomo. Criminal, Shinkai Hayato.
(探偵、荒北靖友。犯人、新開隼人。)
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