Nanatsu no Bitoku is the lighter and much more fanservicey counterpart to Sin: Nanatsu no Taizai.
Nanatsu no Bitoku essentially retconned a few things from Sin: Nanatsu no Taizai and started anew by looking at the virtue/angel counterparts to the sin/demon of Sin: Nanatsu no Taizai.
Nanatsu no Bitoku looks at for the most part of the Seven Heavenly Virtues looking to find "candidates" to fight against the Sins and "hilarious" fanservice ensues and some interactions between the Virtues later on, no seriously that's about it. For the most part, the main Seven Virtues are stock fanservice characters through and through with their virtues themes being used to mold their personalities and how they interact with their coincidentally similar virtuous blank slate candidates.
It's mostly ALL for fanservice however especially with how the anime short is shot like (aka. boob and butt shots whenever it can almost like shoving our faces at their boobs of butts for 4 minutes straight).
The characters even including Michael voiced by Yumi Uchiyama are incompetent at their jobs getting their candidates into "hilarious" fanservice messes, the most egregiously annoying for LA being Sariel voiced by Sakura Nakamura. If there was a "favourite character" in Nanatsu no Bitoku, LA would say Raphael voiced by Lynn if only by character design and by default, though Michael comes in at second.
The animation by Bridge was..."meh" mainly because of the animation being mostly uncensored fanservice, but the character designs are shiny and LA thinks that is the point but the animation looks "weird" at times for an anime short and yes though fanservice is ok, LA will still say that the fanservice in Nanatsu no Bitoku just went overboard to the point of annoyance and LA is an ecchi fan.
Voice acting, well there's not much to say for this type of anime short but really LA just really didn't care about the voice acting, as the FANSERVICE got in the way of that. Yumi Uchiyama, Asami Seto, Shiori Izawa, Ari Ozawa and Lynn were wasted in this production.
Nanatsu no Bitoku is better than Sin: Nanatsu no Taizai by default only because it was a much lighter and softer and more slice of life fanservice show with no bearing on the goal of getting candidates to defeat the sins let alone the finale that did NOTHING about the candidates in the first place, but emphasis on FANSERVICE utterly ruining any dignity to it's characters and shoving the camera in their boob and butt areas as much as it could in the span of 4 minutes didn't help and fine LA is picking on an obvious fanservice anime short like this but damn does Nanatsu no Bitoku even taking out the fanservice has NO substance to it, not even the notion of linking it to Sin: Nanatsu no Taizai (though take that as a good AND bad thing). Even though LA says it's better than Sin: Nanatsu no Taizai, it was quite honestly LA's worst anime short and anime of Winter 2018 by default as a result.
Man, Lucifer was right, the Seven Heavenly Virtues were INCOMPETENT...
