Useless Knight? My Mounts Conquered Every Era

GoodShort synopsis

"Four years as the academy's top prodigy — then he awakens the ""most useless class in existence"": Knight. His girlfriend dumps him on the spot, running straight into the arms of a corporate heir, while the whole hall laughs him out of the room. What they don't know: his real class is Chronicle Knight — heir to the Throne of Mounts, able to contract legendary steeds from EVERY era in history. When Odin's mythic warhorse tears open the sky on a rainbow bridge, and a liquid-metal war machine from the future ignites in flame, his enemies drop to their knees begging for mercy. The ""trash"" everyone mocked is now the S-rank legend the entire academy fears. Mount by mount, he awakens gods, machines, ships, and beasts beyond time. Enemy by enemy, he crushes everyone who doubted him. But the real war is just beginning — an invasion from beyond time itself threatens to erase the entire kingdom. When everyone else retreats, he rides forward with seven eras behind him, the last Knight standing between humanity and extinction. The day they threw him away was the day his legend began. Now it's their turn to regret it."