So 100-man second season has officialy finish, i really appreciate this second season and in this review, that contain spoiler about this season so be careful to not read this review if you haven't watch this season. (Forgive me about my English, it's a little rusty)
So first step: what is 100-man no Inochi no Ue ni Ore wa Tatteiru season 2?:

Aloof and logical middle school third-year Yuusuke Yotsuya is transported to a game-like alternate world. He becomes a third player and takes on a dangerous quest with his classmates Iu Shindo and Kusue Hakozaki, who were transported there earlier. The cold Yuusuke eschews emotionalism and examines all elements with detachment, sometimes even toying with the lives of his companions. Can he protect his party from attacking monsters, difficult incidents, and powerful scheming enemies and win the game?
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#About the Second season:
I really appreciated the plot twist about every mission of our Heroes, thath every mission has a Time Skip about 15 years and i appreciate the
Kahabell return and THE BEST SCENE in this Season, the waited Kiss About
Yuusuke and
Kahabell, and the other 3 arc, the Jiffon Arc and the Last Arc: The Zagroth Arc.

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#About the music
Opening:
BADDEST 8/10
Ending:
Subversive 7/10
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#Charachter Development

The CD of Yuusuke it's really nice expecially the gore part that i really appreciated, i will continue the manga because i'm intrested for the plot.
About
Iu Shindou nothing important, just a little bit of extra romance between Yuusuke, but for the rest, nothing else.
About the Two new heroes:
Keita Torii the classic dumbass hero, but for the other hero
Glenda Carter performed by the voice of
Saori Hayami she is intresting and most important, she like woman....yes.
For the other Heroes nothing to say.
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#Final impressions
My Expectations for I'm Standing on a Million Lives Season 2 has worth it, waiting for this season, too see the Adventure of our Heros has worth it, and beside of the first season, they give us important information about the final boss: The dragon and information about the parallel world and the real world.
So if you want to try this anime give it a shot.