Nemuru Ōgarasu / 眠る大鴉 - Ichiru Kuga (lyrics)

RADIANT MIND - Kuga Shu (lyrics)

FACE-OFF - Kuga Shu x Toraishi Izumi x Kitahara Ren (lyrics)

Anata no Hana / あなたの花 - Issei Kuga (lyrics)

Akaku Somaru Sora / 紅く染まる空 - Ichiru Kuga (lyrics)

NEMOPHILA - QUELL (lyrics)

Above the best - QUELL (lyrics)

BELIEVER -Inori- / BELIEVER -祈り- - QUELL (lyrics)

WING - QUELL (lyrics)

Because you are - QUELL (lyrics)

Suisei no Clover / 水性のクローバー - QUELL (lyrics)

Toki wo Koete / 時を越えて - QUELL (lyrics)

Dear Dreamer, Ver. QUELL (lyrics)

DEAR DREAM! - Hoshitani Yuta x Tengenji Kakeru x Kuga Shu (lyrics)

hanamichi ∞ Go All Out!! / 花道 ∞ Go All Out!! - Hoshitani Yuta x Nayuki Toru x Tengenji Kakeru x Kuga Shu x Ugawa Akira x Toraishi Izumi (lyrics)

HEROISM++ - Kuga Shu x Toraishi Izumi (lyrics)

Fata Morgana - Eichi Horimiya & Ichiru Kuga (lyrics)

Blue Fire Crater - Issei & Ichiru Kuga (lyrics)

Hoshizora / 星空 - Issei Kuga (lyrics)

Diamond Dust - Shu Izumi & Issei Kuga (lyrics)

By Your Side - Tsukigami Kaito x Kuga Shu (lyrics)