Here's the cover:
http://www.mangago.me/read-manga/aiso_tsukashi/mf/v01/c003/4/
Much love and thanks!! <3
ya it's an illustration...which is a pity...a good manga could have happened
The illustrator of this cover is Inariya Fusanosuke.
Oh man, chapter 6 definitely lives up to the teasing in the previous chapters. *_*
Also, can i just say how awesome the older sister is? She is tough, strong and loving.