Tokyo Underground
Ongoing | uraku akinobu | 1998 released
So cliché.. The weak MC with a rare super power but it is not the problem here, they trained so much for days and they get a bit stronger, sure. But the enemy they just sitting around and they getting stronger than the MC without training. Sorry for the grammar error i'm not used to write english.
Tate no Yuusha no Nariagari
Ongoing | ANEKO Yusagi | 2014 released
Eiyuu Kyoushitsu : Honoo no Jotei
Complete | Shin Araki,Takashi Minakuchi | 2000 released
Shishunki no Iron Maiden