Demivee

Congrats - you'll have a blast!! I only got to attend 2 lives during my time in Japan, but there were 8 acts at the second live so I felt like a got at least a solid taste.

Out of everyone I saw, I would argue the gulu gulu and MAMIRETA are absolute must-sees. Extremely high energy and fun from start to finish.

I would also include DIMLIM in this sentiment, but I don't know how they've been since losing 2 members so I can't confidently say either way. They were great when I saw them, though - very emotive, raw performance, especially compared to many of the other bands that played.

Past that, Hueye and MonstlloW impressed me a lot for newer bands so if you happen to catch them at a live you won't be disappointed. 

Have fun!!!

Wow, thank you so much for your reply!
 

I will definitely check out the bands you recommended.

As for DIMLIM I am a huge fan and my fingers are crossed that they will anounce a concert in February.

I hope I will find such an event as you visited. That would be as in my imagination: a small live house and some newcoming bands.

I will report you my experiences. =)