Mune ga Dokidoki
Opening Song

 Hyaku-nen-buri no seikimatsu Nake to iwarete boku wa waratta 
 Hisakata-buri no seikimatsu Hiroi sekai e tobidashite yuku 
 Kodomo no koro ni wakarikaketa koto ga otona ni natte wakaranai mama 
 Eraku mo nai shi Rippa demo nai 
 Wakatte 'ru no wa mune no dokidoki Mune no dokidoki dake 
 
 Kakko ii ka wakaranai kedo osaekirenai yume wo mita n' da 
 Sakusen tatete jitto matsu yori kodomo no mama de butsukatte yuku 
 Uchuu no hate ni hata wo tateta to shite mo uchuu no nazo wa wakaranai mama 
 Eraku mo nai shi Rippa demo nai 
 Wakatte 'ru no wa munu no dokidoki 
 Eraku mo nai shi Rippa demo nai 
 Wakatte 'ru no wa mune no dokidoki Mune no dokidoki dake