メノウ means “agate,” a naturally patterned gemstone known for its beautiful layers and colors. In the song, it appears in the surreal image of “Virginia Woolf’s agate button,” combining literature and a precious stone in a mysterious, dreamlike scene.
THE BLUE HEARTS fill this song with odd, bright images, and the fun is in how little they bother to connect them. It opens on "ヴァージニア・ウルフのメノウのボタン" [Virginia Woolf's agate button], yes, the English novelist, swaying on a cellophane bus seat. There's no story about her. She's just one more strange object in a dream.
Then the seasons start arriving early. "ねじれた夜に 鈴をつければ 月に雪が降る" [if you tie a bell to the twisted night, snow falls on the moon] is pure nonsense in the best way, and the next line answers it with "水平線の見える場所は もう春だ" [where you can see the horizon, it's already spring]. Later it's "輝いている夜明け前は もう夏だ" [the shining time before dawn is already summer]. That little もう ("already") keeps doing the work: things are always ahead of schedule here.
The heart of it is the title, the letter. "手紙を書いたなら 空に飛ばすんだ" [once I've written a letter, I'll send it flying into the sky], and "風が運ぶだろう 君のところまで" [the wind will probably carry it all the way to you]. No stamps, no address, just trust in the wind.
The last images are a kid's day out: "怪獣退治" [monster slaying] under a blue sky, and running down a "ろうせきの道" [soapstone road], the chalk-like stone Japanese kids use to draw on pavement, "ギターを片手に" [guitar in one hand]. It feels like a band remembering being ten.