うららかな is a poetic adjective describing something bright, calm, and pleasantly gentle, often associated with beautiful weather or an idyllic atmosphere. It is less common in everyday conversation, making it a memorable word for learners.
In the song, it describes the softly shining, drifting stars in 流れる星うららかな, adding a dreamy, romantic mood to the singer's feelings of being completely absorbed in love.
"夢中" (muchuu) means being completely absorbed in something, so lost in it you forget everything else. BE:FIRST use it for a crush that has taken over every waking hour, and the chorus says so plainly: "君に夢中 四六時中" [I'm crazy about you, all day and night]. That 四六時中 is a great phrase to steal. It literally means "four times six hours", which adds up to the whole day, and Japanese speakers use it for "24/7".
The verses start small and a little guilty. He remembers "昨日のごめん" [yesterday's sorry] and admits "気にしてないって嘘はつけたけど" [I could lie and say I don't mind, but]. Then the feeling turns into a ride: "好きが募ってローラーコースター" [my love keeps piling up, a roller coaster], spinning and dropping until he wonders if it reaches her. The chorus goes big, a bit much in the best way, wanting to meet her "来世でも 前世でも" [in the next life, in a past life too] and promising to call her name "何万回でも" [tens of thousands of times]. My favourite detail is quieter: "ただいまとおかえり" [I'm home, and welcome back], the two everyday greetings Japanese families swap at the front door. Putting them in a love song turns romance into coming home to someone, every single day.
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