This is honestly one of the best VN's ive played in the longest time, just downloaded a few days ago and I am addicted.  I usually speed read through the story but First time in a very long time i have taken my time and read everything.  The characters are well developed you feel a connection to all the characters and get invested in the story.   
Momoyo is my favorite playthrough so far.  I love older sister relationship they have and having to convice the all powerful girl to be yours. 
My second favorite character is Miyako, her antics are great.  Wanna make the sad gloomy girl Happy!  Cant wait for her fully translated route, i feel bad for crushing her love everytime i play another characters route. 
Anyone know an estimated release for the translation of miyako?  i read somewhere it was march of 2012 but the date got pushed back.  Hopefully soon is all i can say.