During the Holostars 4th anniversary event the JP stars were playing a game of guessing the Holostars songs, the last 2 songs were to guess the song along with which Tempus member was singing it.

You see the excitement in the JP stars when they see their kouhais singing their songs, there's a super cute moment with Rio in both songs.

Source: 【＃ホロスタ4周年】ホロスターズ4周年記念特番2時間SP【3D配信】
https://www.youtube.com/live/TFNF6c3Y...

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