Couverture de Light Novel Mecha Fantasy

Commercial Japanese light-novel cover illustration for a fantasy mecha story, vertical poster composition. Dominating the center foreground from a low angle is a sleek, ornate humanoid mecha in white and silver armor with rich gold trim, glowing cyan energy lines, an emerald core, a crown-like crest helmet, and a flowing royal blue cape edged in gold. Eight large translucent green crystalline wings spread symmetrically behind it. In its left hand, it holds a fantasy-tech spear with a glowing blue blade. At the robot's feet stand two adventurers: on the left, a determined red-haired heroine with braided hair looking up; on the right, a young dark-haired male protagonist in a tunic reaching toward the mecha, seen from behind. Epic ruined sci-fi fantasy cityscape setting with gothic spires, drifting smoke, cosmic sky with stars, planets, lightning, and distant flying warships. Cinematic lighting, rich blue-green-gold palette, polished anime key visual style. Top typography includes 《[本格異世界SFロボット戦記]》 above a large metallic logo reading [ASTRAIA] with a small subtitle below. Bottom typography features a two-line glowing white and gold catchphrase: "[乗って！ユウキ！ その叫びが、世界の運命を決めた！]".