I've only read a few of Ogasawara Uki's works but I have to say, this is probably one of the better ones of them. Black Sun was great but... Just had something off about it, the other shorts seemed jumpy, short and a tad bit pwp, but this is has a nice flow of progression, a few nice smutt scenes, and some lovely fluffs between Miya and Rei, it's perfect and definitely a favorite from this mangaka~
Houyou Jikken