Sniper Talker of Mihama Gakuen, a special skill training school, heads to a remote island in the Philippines for an overseas joint training camp with St. Yale Foreign School with members of the privately-owned work intelligence training organization SORD.
However, he was involved in the "trouble" of a top secret operation aimed at destroying the weapon moonshine organization, and decided to participate in the operation to chase the escaper Gumi of St. Yale.
During his mission, Toka meets his memories with his parents and his unfulfilled promises with his old friend, Shiho, and thinks about Gummy's circumstances. What is the answer that Talker came up with while each speculation intersected?
特殊技能訓練校・美浜学園の狙撃手トーカは、民間委託型工作諜報員育成機関SORDのメンバーたちと共に聖エール外国人学校との海外合同合宿のためフィリピン離島へと向かう。
しかし武器密造組織壊滅を目的とした極秘作戦の"トラブル"に巻き込まれ、聖エールの脱走者グミを追う作戦に参加することに。
任務に際しトーカは、両親との記憶や、昔の友人・シホとの果たされることのなかった約束と邂逅し、グミの境遇に想いを馳せる。それぞれの思惑が交差する中、トーカの導き出した答えとは――？
