Giyuu's crow is very old. The reason why he never replies to Tanjiro is probably because he's terrified of the crow. He's scared that the crow will make a mistake and get hurt. (But he still worries a bit about the messages not going through)
Headcanon that once Giyuu tried to send a letter back to Tanjiro, but it ended up going to Ubuyashiki instead. He simply chuckled and hid the paper for fun.
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kny headcanons
Randomi have no time to finish my homework but guess what? i have all the time to write stupid headcanons of our precious children and cry over the manga [Warning: manga spoilers] Disclaimer: everything written in this book is not accurate nor canon, it...