First, I'll give you links to my observations of the first three chapters of this game.

Contains Chapter 3

Chapters 1 and 2

Now for Chapter 4... as I said in my post on Chapter 3, the bottom line for this is that if you liked the first three chapters, you'll like this one.  It is humorous, it is bloody, and it contains an odd mix of the grim and abnormal slice-of-life.  I laughed out loud - literally - several times while playing this game, and I honestly liked the insights on Chris's character that this gave.  This chapter also serves as an excellent 'settling in' chapter for Gumi and Maki, as Chapter 3 was focused too much outside of the normal daily setting to get a picture of how she was dealing with her change in situation. 

The introduction of yet another (female) character has me feeling a bit exasperated, but since Taiga fits pretty well with the crew, I didn't feel any irritation.  The combat scenes in this are pretty much just one-sided 'pow-pow, the enemy dies' one-sided massacres, except for one of them. 

I'm going to be blunt... in six months, they probably could have done two chapters like this, so I can't help but wonder why they insist on separating this game into such tiny chapters.  While I won't say that the first two chapters (released together) were 'satisfying' in that sense, I nonetheless felt like I'd spent good money, rather than throwing it away.  Unfortunately, at the price they are offering these chapters, I would much rather pay seven times as much for a full game two years from now than be forced to wait for each chapter.