Toshikazu Kawaguchi was born in Osaka, Japan, in 1971. He formerly produced, directed and wrote for the theatrical group Sonic Snail. As a playwright, his works include COUPLE, Sunset Song, and Family Time. The novel Before the Coffee Gets Cold is adapted from a 1110 Productions play by Kawaguchi, which won the 10th Suginami Drama Festival grand prize.

The second novel from the author of the phenomenon, Before the Coffee Gets Cold: more tales from Cafe Funiculi Funicula, where customers may travel back in time – if they obey the rules.