(Good) ReLIFE

Series in one sentence:  
An adult man kinda befriends and falls in love with a teenage Kikyo from Inuyasha, but not really.

Series in more sentences:
A man in his late 20s is down on his luck after he quit his job because of moral objections with the company, but then gets approached by a stranger who offers him a job as a test subject for his laboratory, involving an age reducing drug.
The man feels cornered enough to agree to play the role of a high school student for a whole year, whilst being monitored by the lab. His presence has a positive effect on everybody he meets; though the problems of his new teenage friends remind him of his past with his old job.
 

I was quite entertained, though I will say that after I read there won't come a proper second season, just 4 OVA episodes, I think this anime wasted too much time focusing on characters other than the main one. The volleyball plot alone was way too long and the guy hardly made an appearance in that. I didn't care about these other characters and their sudden problems, it didn't make them more interesting. It wasted valuable time that should've been given to the people this show is supposed to star.

The rushed romance plot at the end was rather weird as well. One of the guy friends basically gets talked into liking his best friend, and indeed, suddenly has romantic interest for her, just because the main character threw some simple questions at him. And the series then devotes more time showing off the romantic journey of these two kids than of the ones we actually care about;

The main character and his "love interest" are by far the most interesting elements in the show, and share the best interactions, which is why it's disappointing to have seen so little of them together. While they're lovely in each other's company, they don't hang out enough for me to dub these two friends. Rather acquaintances who only sometimes text each other. This makes the last episode, where they basically struggle to not jump into each other's arms, not make sense to me.
And they're not the only characters with a lacking relationship. Since every 2 episodes seems to skip a month, it doesn't feel like any of these people are really that tight with each other. They act like it when they're given a scene, but every other episode, they don't even speak to each other.

Also, what's with Japan's belief that a person in his 20s is old? The main character won't stop talking about it, as if he's one foot in the grave already. There's hardly even a difference in his appearance when he turns into his 17 year old self. Same thing with his guide.
27 is still young and 10 years is not that long ago, I remember high school vividly. Maybe the main character should've been in his 40s for his concerns to actually qualify as concerns.

Anyway, since I know I'll never read the manga, I'm still eager to see these last few episodes. Hopefully they'll make some things right, though I'd rather have the creators animate more seasons. As it stands now, my grade for the show is just barely "good", while it should not be a challenge to continue this thing and make it a top quality romantic drama.
Nobody will fault a slow first season, as long more seasons follow, which is why it's a sad thought that the TV version of ReLIFE will likely stay incomplete.