境界觸發者
故事梗概
三門市,人口28萬人。某一天,通往異世界的門在這裡打開了。從異世界而來的侵略者「近界民」,任意蹂躪門附近的地區,讓整座都市陷入恐懼之中。這時,突然出現一個神秘的團體擊退了近界民。 被稱為境界防衛組織「BORDER」的他們,在這邊的世界建立了巨大的基地,以對抗陸續來襲的近界民。
異次元からの侵略者「近界民」の脅威にさらされている三門市。そこに住む少し正義感の強い中學生・三雲修は、謎の転校生・空閑遊真と出會う。遊真の行動に振り回される修の運命は!? 最新型SFアクション始動!!
Mikado City, an otherwise peaceful city, is suddenly invaded after a gate from another world opens seemingly from nowhere. Interdimensional monsters called "Neighbors" attack, man-made weapons prove to be ineffective against them, and the city is quickly destroyed. When all hope appears to be lost, a mysterious group known as the Border Defense Agency begins to retaliate using specialized technology called "Triggers" and manages to halt the invasion.
Four years later, people in Mikado City have grown used to the occasional battles with the Neighbors, and have returned more or less to their everyday lives. Border has become popular. One day, a mysterious white-haired student named Yūma Kuga transfers to the local school. Kuga is actually a strong humanoid Neighbor, a fact that he wants to hide from Border. In the school he meets another student, Osamu Mikumo , who is secretly a C-rank Border trainee. Since Kuga is completely oblivious about life in Mikado City, it falls to Mikumo to guide him through it, and to prevent him from being discovered by Border.