This manga is VERY similar to the movie Frequency (2000)
http://www.imdb.com/title/tt0186151/
I HIGHLY recommend it if you liked this manga's concept of time travel through a communication device.
WHY THE F*** DOESN'T THIS ARTIST HAVE ANY OTHER MANGA?!?!?!
THEIR ART IS F***IN BEAUTIFUL!!!
(The second story)
If I can't assault you in real life, I'll just assault you in your dreams! xD
hahahaha (≧∀≦)