[Mas/Osh/Mat/Ume] [bad word] no suizokkan wa
    [Mas/Osh/Mat/Ume] hitokage mo sukunakute
    [Mas/Osh/Mat/Ume] aoi RAITO ni ukabu
    [Mas/Osh/Mat/Ume] suisou ni tachidomatta

    [Hay/Oku/Kur/Nar] mita koto mo nai sakanatachi
    [Miy/Oho/Sat/Kob] oyogi [bad word] sadame
    [Aki/Kas/Ono/Nor] ai ga [bad word] to
    [Aki/Kas/Ono/Nor] [bad word]     [Aki/Kas/Ono/Nor] watashi ni [bad word] wa

    anata dake ga
    [bad word]     hoka no hito wa muri na no
    [Mas/Osh/Mat/Ume] hitori shika
    [Mas/Osh/Mat/Ume] aisenai wa
    anata dake ga
    [bad word]     semai sekai
    watashi wa
    [Hay/Oku/Kur/Nar] kagirinaku aishi [bad word]     kaiyuugyo

    [Hay/Oku/Kur/Nar] gensou teki na mado wa
    [Hay/Oku/Kur/Nar] shiranai umi no soko ne
    [Miy/Oho/Sat/Kob] ikimonotachi wa itsumo
    [Miy/Oho/Sat/Kob] umareta basho de [bad word] 
    [Mas/Osh/Mat/Ume] shinka [bad word] sakanatachi
    [Aki/Kas/Ono/Nor] kanashimi wo norikoete
    [Miy/Oho/Sat/Kob/Hay/Oku/Kur/Nar] kankyou ni atta
    [Miy/Oho/Sat/Kob/Hay/Oku/Kur/Nar] aishikata nante
    [Miy/Oho/Sat/Kob/Hay/Oku/Kur/Nar] watashi wa dekinai wa

    [bad word]     [bad word]     ichizu [bad word] omoi wa
    [Miy/Oho/Sat/Kob] bukiyou na
    [Miy/Oho/Sat/Kob] oikakekata
    [bad word]     [bad word]     okubyou dakedo
    watashi wa
    [Aki/Kas/Ono/Nor] itsumade mo yasumu kotonaku
    itooshii

    anata dake ga
    [bad word]     hoka no hito wa muri na no
    [Mas/Osh/Mat/Ume] hitori shika
    [Mas/Osh/Mat/Ume] aisenai wa
    anata dake ga
    [bad word]     semai sekai
    watashi wa
    [Hay/Oku/Kur/Nar] kono mamade aishi [bad word]     kaiyuugyo

english translation

    At the nighttime aquarium
    With so few shadows by the people
    They float in the blue light
    They stop in the fish tank

    All the fish I’ve never seen before
    Their fate is to keep on swimming
    But if love dies,
    They can no longer live on
    I’m so much the same as them

    I have a capacity
    Only for you
    It’d be impossible with anyone else
    Only one person
    I can love
    I have a capacity
    Only for you
    In such a small world,
    I
    Endlessly keep loving
    migratory fish

    In this magical window
    Is the bottom of an unknown sea
    All living creatures always
    Live in the places they’re born in

    All the evolving fish
    Surmount their sadness
    And match their environments
    With my way of loving you,
    I can’t do the same

    It’s been decided for me
    This capacity of mine
    This wholehearted feeling
    Is just an awkward
    Pursuit for you
    It’s been decided for me
    This capacity of mine
    I’m a coward,
    But I’ll
    Incessantly
    Hold you so dear to me

    I have a capacity
    Only for you
    It’d be impossible with anyone else
    Only one person
    I can love
    I have a capacity
    Only for you
    In such a small world,
    I
    Endlessly keep loving
    migratory fish