this is so underrated wtf, with the 'you're my own personal sunshine' too its just wakafnlkgnaen
basically - (this is me assuming their roles as it aint shown) the sun follows the uke everywhere and makes it aLWAYS HOT, the rain follows the seme everywhere :( , seme likes running hiking exercise (cant do that shit in the rain lmao) and the uke prefers to stay indoors, the two of them meet and the seme forces the uke to join the hiking club (? i think) he goes to <3 and from there LOVE BLOOMS
Kuchizuke Wa Niji No Ue De