Kaibutsu, or Monster in English, is the Season 2 opening theme of Beastars. The song is based on a story that Beastars creator Paru Itagaki specifically wrote for this use.
Ā, subarashiki sekai ni kyō mo kanpai
machi ni tobikau arai koe mo mite
Minu furi shiteru dake no tsukuri mon sa
Ki ga furesō da
Kurakura suru hodo no ī nioi ga
tsun to sashita hana no oku me wo samasu
Hon'nō no mama kyō wa dare no ban da?
Kono sekai de nani ga dekiru no ka?
Boku ni wa nani ga dekiru no ka?
Tada sono makkuro na me kara
namida kobore ochinai yō ni
Ā, negau mirai ni nando demo zutto
Kuraitsuku kono machigai darake no
Sekai no naka kimi ni wa waratte hoshī kara
Mō dare mo kizutsukenai
Tsuyoku (×2), naritai'nda yo
Boku ga boku de irareru yō ni
Tada kimi wo mamoru sono tame ni
Hashiru (×2), hashiru'nda yo
Boku no naka no boku wo koeru
Subarashiki sekai wa kyō mo antai
Machi ni uzumaku warui hanashi mo
Shiranai (×2) furi shite me wo sora shita
Soki no sata ja nai na majime ni kikazatta
kōshin narasu ashioto ga hazumu ikisaki wa
kienai (×2) aji ga shimitsuite iru
uragawa no sekai
Dare mo kanashimasezu ni ikiru koto
hamidasazu massugu ni ikiru koto
Sore ga machigawanaide ikiru koto?
Ari no mama ikiru koto ga seigi ka?
Damashi (×2) ikiru no wa seigi ka?
Boku no aru beki sugata to wa nan da?
Hontō no boku wa nanimono nan da?
Oshiete kure yo (×2)!
Kyō mo kotae no nai sekai no naka de negatterun'da yo!
Bukiyō da keredo itsu made mo kimi to tada waratte itai kara
Haneru shinzō ga karada yurashi sakebun'da yo
Ima koso ugokidase
Yowai jibun wo nando de mo zutto
kuraitsukusu kono machigai darake no sekai no naka kimi ni wa waratte hoshī kara
Mō dare mo nakanai yō
Tsuyoku (×2), naritai'nda yo
Boku ga boku de irareru yō ni
Tada kimi wo mamoru sono tame ni
Hashiru (×2), hashiru'nda yo
Boku no naka no boku wo koeru