After returning from the Kingdom of Mismede, Touya and the others enjoy their daily life. Yet behind the scenes the women battle over the bicycle Touya created! Notice it, Touya!
At Sushie's request they head to Mismede and return to find Leen and Paula.
According to them, the crystal beast Touya and the others once defeated had appeared in Mismede as well, and Leen struggled to defeat it. So she began to take interest in Touya after he defeated the beast.
Acutely interested in the high spec Touya, Leen asks Touya and the others to investigate some ancient ruins, leading to the start of a new adventure! (Made easier with Gate.)
As her little sister, I feel 
I need to know what happens.
!يحقُّ لي أن أعرف بصفتي أختها الصّغيرة
Ich als Schwester
muss alles erfahren.
Debo saberlo, como su hermana menor.
Debo saberlo, como su hermana pequeña.
Entre membres de la même famille,
c’est normal.
E in quanto sorelle, mi sento in dovere di sapere!
Eu devo saber, já que sou a irmã mais nova!
Как её младшая сестра,
я должна его засвидетельствовать.