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Chapter 3 - Page 18
The text is, like the previous page, Ayumi Ishida's "blue light Yokohama", a 60's song about... Love, i guess? I always liked it. 

There's a scene in the manga Vulgar Ghost Daydream where the main character Misaki is seen singing this to herself. Every time i need a sort of sweet, sorta old-school song, i always use Blue Light Yokohama.