Haruiro Astronaut

mami and tomoki have always shared everything in life, they are identical twins, yet so different in character and personality: mami tender and helpless, courted by boys to whom she doesn't never “no” for excessive kindness, tomoki with a strong sense of duty and a great spirit of sacrifice, would do anything to see her sister happy. but comes a time, however, when one realizes there are things cannot be shared, especially when it is something extremely rare and unique …. just like an alien?!