So let's just jump straight in there!
Story - 8/10.
Nanana, a girl who was murdered 10 years before our story, was collecting treasures with particular powers (known as 'Nanana's collection') on Nanae Island. She is currently bound to the room she was murdered in, which is where Yama Juugo comes in - he is assigned to this room, which sets us up for his adventures to find the Nanana's collection treasures.
A decently original idea, told pretty well - the show had plenty of running gags, some got old quickly and some remained pretty funny (at least for me), sometimes it was unnecessary but most of the time, when it needed to be, there was a more serious feel.
So the story basically revolves around Juugo's quest to find Nanana's collection and the adventures he has during that search and the people he consequently meets.
Art - 8/10.
Although the character design was nothing hugely original, and the style quite common of contemporary anime, it was animated well nonetheless. The scenes were set pretty well, especially those in the ruins (which is where Nanana had hidden the treasures from her collection). Each ruins was different and had a unique style to it which was interesting to behold.
Sound - 7/10.
To be honest, as with most anime I watch, unless it's outstandingly atmospheric the music in the background is mostly just more of a scene-setter, so I don't notice it unless it stands out - I don't remember thinking any of the sounds were out of place or anything but nothing outstanding. The scene was set by sounds well when it came to the ruins though, I thought.
The voice acting was pretty on-par, nothing really stood out to me though. Emotions were portrayed pretty accurately and it didn't make me feel like it was being forced, which is always a plus.
The OP set us up for a nice relatively light-hearted episode of adventure and fun which was fitting.
Character - 7/10.
Nothing hugely original in the character department. You have your main male and female leads and the Adventure Club (mostly).
Juugo is a pretty standard perverted male protagonist, though his development especially in his relationship with Nanana is portrayed well - at first they merely tolerate one another but their relationship develops quite well throughout the series. Nanana is a little unusual of a character - she's a ghost, but she's not the standard vengeful type - instead, she has NEET tendencies and loves pudding. As previously stated her relationship with Juugo develops quite nicely throughout the series as they come to harmonise more with one another.
Tensai is a character I couldn't really stomach. Although she was admittedly clever and helpful, she was pretty far up her own ass, so it was hard to appreciate what she was doing as more than a way to confirm her own opinion of herself. She had a couple of tender moments but for the most part I didn't really enjoy her tsundere-ish tendencies.
Daruku was a token trap, and the source of the majority of the running gags in the show (along with Juugo's pervertedness). Doesn't really play much of a role in the show other than to provide aforementioned gags, so I didn't find he/she added much to the story.
Other than that, the antagonist is worth a mention though he only appears in the latter few episodes, he spices things up a little.
Enjoyment - 8/10.
Though this series was short, it was decent overall and I did enjoy watching it every week to see what our characters would get up to. The ending left quite a lot to be desired, though, and no loose ends were really tired - this gives rise to the question of another season.
