I Cosplayed Sakusa and Reincarnated as a Baby?

He was asked to cosplay as Sakusa Kiyoomi for a group photoshoot, but then he transmigrated. Had he become Sakusa Kiyoomi?

No, he'd become his older brother.

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Sakusa Masaharu, Sakusa Kiyoomi's older brother.

Motoya Komori really admired Masaharu. He was sunny, handsome, and gentle, and he was great at volleyball. On the court, he was a trusted ace, and whenever Motoya asked him something, he always answered carefully and thoroughly. When he grew up, he wanted to be just like Masaharu!

Sakusa Kiyoomi really hated his older brother. He'd leave his dirty clothes scattered around, come home from evening practice drenched in sweat, and fall asleep right in the entryway. In the end, Kiyoomi had to clean up both the dirty clothes and his filthy brother. When he grew up, he would never be like his brother!

Sakusa Masaharu, Itachiyama's ace spiker, the king of the court.

The heart and leader of the team, embodying Itachiyama's glory like a true king.

Masaharu's diary:

A cloudy day, XX month XX, year XX

I wish I were more popular...

A cloudy day, XX month XX, year XX

I hope my little brother will call me "big brother" instead of "Masaharu"...

A cloudy day, XX month XX, year XX

My little brother had a fever. I heard him mumble, "I love big brother the most."

I knew it! Seiji really does love his big brother the most!

Sakusa Kiyoomi flips through his brother's diary and points to this entry, looking at Masaharu. "Cross this one out. I never did that."

Masaharu stammers and pulls out his phone. "...I recorded it."

(Blurb to be added)

Theme: A taste of youth