U know google says kikuo is a Japanese song writer who makes disturbing songs , and maretu is just a normal Japanese rock artist but maretus songs are more disturbing than kikuos that's why I listen to all if maretus songs
For maretus songs take this a example for what I men's disturbing : 流れ出す血と、涙、涙
あなたを暗く暗く染める
取り出し給え、刃、刃
まだ止まっては いないだろ
あなたの心臓は。
知らないか 彼らはけらけらと嗤って
宝物を全部、奪い取るだけ
肥えきって ぶくぶくと煮立った五体を
みすぼらしく 永劫、曝けるだけ
The song is called NAMIDA , his other songs get more disurbing