Hiyoku -Contract with you- (instrumental) (OP Single)
Chiisana tori, tobitatenu, orokana kotowari Yureru kigi ga, zawameku toki Hane wa, ibuku no darou
Subete ga, omoi no mama ni Ikanu konjou, sore yue ni
Kago no naka no kotori, ima koso Sono ryouyoku de tobitachitamae Sore ga shin no aru beki sugata Dare mo jama wa dekinai
Hito wa tsune ni sagashiteru, kanmina binetsu wo Kagayakashii mana no hate ni Hito wa kowarete iku Todaenu, genrou no me wo Tomo ni kasareta sadame wo, ikitai
Kago no naka no kotori, habatake Kaze ni saraware omomuku mama Onaji sora no moto ni umareta Itami, wakachiau tame
Kouren no yuuhi ni Somatta hitomi Tsukisasu omoi wa Tsurugi to kashite Kono yo ni habikoru Taenu, hiai kara Jibun, igai ni Mamorikireru mono wa, inai
Ta ga tame, hane wo hirogeru no ka Wakare no kaze, fukiareru toki Kioku no ouka tonari chitte Utsukushiku sari, kieru
Kago no naka no kotori yo, itsu no hi ka Kono ryouyoku de dakitomeyou Onaji sora no moto ni umareta Fukaku, itooshi kizuna wo