Dungeon Seeker:

Dungeon Seeker is another isekai light novel series turned manga, and a good one that seems to actually be approaching its ending.  By keeping to a tight narrative structure based around revenge against a limited set of people, the story doesn't just spiral off into infinite side tracks.

After Dungeon Seeker comes Kuro no Iyashi, another isekai manga, but it doesn't seem to be as fun.  At least it can kill some time until the playoffs.

Egao no Daika turned out to be a big disappointment.  They killed off the male lead so randomly.  In addition, it feels like the setting is completely contrived and unbelievable, making the whole thing just worse than if it had been set in a standard medieval isekai or present day school.  How do you have high technology mechas and spaceflight derived colony planets and still lack the ability to grow crops or fly or nuke your opponents?  None of it makes any sense.  The technology is just at whatever level the author feels like it should be to suit the plot at the moment, so some things are ridiculously advanced while others are ridiculously primitive, even though it's impossible for knowledge to work like that.

No technological civilization has ever forgotten how to make its basic tools.  Nukes, airplanes and hydroponics wouldn't just 'disappear' from people's memories.  Likewise, once spaceflight is invented, the technology won't just be forgotten and lost afterwards, it will be the new and permanent norm.  It's like forgetting how a radio works.  Didn't these people write any of their invention blueprints down?  It's just ridiculous as a plot premise.

If they wanted to write a story about primitive warfare -- more primitive than world war II technology despite all the bells and whistles -- then they shouldn't have set the story in a futuristic universe.  It's just so stupid.  A completely unnecessary own goal.  Dropped.