异世界传送门开幕镜头

单帧动漫画面，异世界系列开幕建立镜头，现代数码绘画风格，高色彩对比。广角低角度镜头越过翠绿草原，朝向高大紫色闪电传送门。前景是普通高中男生背影，手提书包。右下角仿旧羊皮纸字幕牌写着「Isekai no Tobira」。色调：深紫、电白、翠绿、暖琥珀、天空蓝。

A single-frame anime still functioning as the opening establishing shot of a fantasy isekai series, rendered in contemporary digital painting style with high color contrast. Wide-angle low-to-ground shot looking across a sunlit emerald meadow toward a towering translucent portal of crackling violet and white lightning. In the foreground, the back-view of an ordinary high-school boy in a grey hoodie and school shoes stands transfixed at the meadow's edge, school bag hanging from one hand. Distant jagged mountain ranges under a twin-sun sky. The portal interior glimpses an alien castle of onyx and amber. Volumetric god-rays pierce through tall grass. In the lower-right corner, a series title card on aged parchment texture reads "Isekai no Tobira" in dark-ink brushstroke kanji. Color palette: deep violet, electric white, emerald green, warm amber, overcast sky blue.