Koi wa momoiro (Love is pink (technically, peach blossom colour)) by Haruomi Hosono. Hadn't heard this original version before. Loving it.
I've always loved this song for the sensory descriptions in it: the fragrance of the soil, the odour of this paint, the wall is ivory (coloured), the sky is glass (coloured)... the smell of the rain, the stink of this mosquito coil smoke (simply "kabi" in Japanese), the sky is grey, love is pink.
Below is the version I first heard, by Sunny Day Service. Quite different.
And I just found this lovely version... Very nice indeed.
And because you have heard it so many times now, here is the chorus so you can sing along.
Koko wa mae ni kita michi (This is a road I've been on before)
Kawazoi no michi (A riverside road)
Kumo no kireme kara nozoita (Apart from the break in the clouds)
Mioboe no aru machi (It's a place I know by sight)