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Artist's commentary
Here's what I think: This "breast" kanji isn't as in "boobs", but as in "鍾乳石" or "stalactite". Apparently, "hatsune" mainly means the call of the uguisu, the nightingale, at the start of spring. So in short, the "Hatsune breast" means the nightingale's n&#(*$%((#*NO CARRIER
Thank you very much to everyone kind enough to come by my space on the second day of Comiket. It was ridiculously crowded and hectic even inside the booth, so I briefly wondered how things would work out, but somehow, it all ended safe and sound.
Everyone who's going on the third day, please hang in there! I have some business to attend to, so I couldn't go on the third day. (^^;)