Tsukasa Tenma is an awkward, caring piano player who is a bit egotistical at times. He started piano to make his little sister Saki Tenma smile but overtime the piano took over his life and it was the only thing he did daily. He eventually forgot why he started piano. A SEKAI, a world inside his phone, was created for him to find his true feelings.

Tsukasa is afraid of bugs, even butterflies even though he thinks the patterns are pretty.

Tsukasa is quite fond of reptiles like snakes.
