I can’t tell who’s who. All the couples just blended in my mind and I have no clue who’s what...
Oops
Spoiler
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Tall black hair is Take (who was untranslated as Yuya for the first few chapters) he's friends/classmates with Masato the youngest and smallest brother.
Take likes Kento the older brother with light long hair.
Short one with black hair is Ryou (tho called Ame in the first few chapters) he's the oldest of the siblings and not related by blood.
Middle child of the blood related siblings is Hayato. Hayato likes Ryou.
There's also Kentos random fuckbuddy
the owner / employee of the flower shop that Hayato works at is a couple from another one of sensei's stories
Y is this under historical???
Good question