Darwin's Game
101 Adapted to Anime Cell Phone----> Survival Game ---> Game of Death Special Ability Gunfighter Strategic Battles Investigation Unrealistic Fighting
Survival: Shounen S no Kiroku
99 After the world is encased in water a boy is left on a island to fend for himself learning skills to survive in the wild
Suicide Island
166 A LOT OF FIGHTING AAAA a group of suicidal people sent to a island to survive. Lots of conflict b happeninnnnnn ! MC learns some sick ass survival skills after time also finds some potential gf (she's pretty chill not annoying and usually in a calm manner I do say)
Sousei no Taiga
72 This is superb, a historical theme where the mc and his friends go and check out a cave which got some mysterious symbols on it making the group suddenly go back in time! The mc gets a huge character growth that even the friends around him realize it. There are fights to animals and tribes people. For romance one of the girls in the group is hella annoying but this other tribal girl is not at all annoying and makes the romance acceptable like she's so badass you gotta love her.
Ajin