Monochrome Summer Manga Walk

Goal: Create a black-and-white manga page titled {argument name="series title" default="谷戸の夏休み　八月九日"}, page indicator 1/6, showing a quiet summer walk to the sea by a slim young man and an oversized hamster companion.

Canvas: Vertical manga page, clean white margins, monochrome screentone and ink wash, detailed shoujo/seinen background art, high contrast summer sunlight, fine hatching, realistic architecture and foliage. Place a small footer centered at the bottom: 「はむ（台本：Opus5）」.

Layout: Use exactly 5 comic panels arranged as follows: 1 large panoramic top panel spanning the page width; 3 equal vertical panels across the middle row; 1 large panoramic bottom panel spanning the page width. Thin black panel borders and generous gutters.

Characters: The main character is {argument name="main character" default="a tall slim young man with slightly messy dark hair"}, seen mostly from behind, wearing a white long-sleeve shirt with rolled sleeves, a fitted black vest, black trousers, and dark dress shoes. His posture is calm and slightly aloof, walking with hands relaxed or in pockets. The companion is {argument name="animal companion" default="a very large fluffy hamster"}, round-bodied and knee-high to the man, wearing a small straw boater hat tied with a dark ribbon; it follows him everywhere and looks up at him in the final panel.

Panel details: Panel 1, wide top: the man walks away through an old tiled-roof wooden gate on a stone path, surrounded by dense summer greenery and stone walls; the hamster trails behind. Add two vertical narration boxes: left box 「崖と海まで歩いた」 and right box 「八月九日（日）はれのち風」. Panel 2, middle left: close low view of the man’s legs and shoes walking ahead on a sunlit gravel path, with the hamster behind in the foreground; add small sound text 「じり…」. Panel 3, middle center: the pair walk along a narrow railway crossing or seaside town pedestrian path, with crossing signals, utility poles, tracks, and crates; add sound text 「カンカン」. Panel 4, middle right: the pair walk down a leafy lane under bright dappled sunlight; add cicada sound text 「ジイジイ」. Panel 5, wide bottom: open beach scene with sparkling ocean horizon, bright sky, clouds, and strong sun rays at the upper left; the man stands near the shoreline facing the sea, while the oversized hamster fills the right foreground looking up at him. Add one speech balloon from the hamster or near the hamster reading {argument name="speech balloon text" default="ねえ、砂って不思議だと思わない？"}.

Visual style: Nostalgic Japanese summer vacation manga, cinematic quiet pacing, extremely detailed hand-drawn backgrounds, realistic light through trees, shimmering sea, subtle screentones, no color. Keep all visible Japanese text hand-lettered vertically where appropriate. Avoid extra panels, extra characters, watermarks, or modern UI elements.