DBDR-002: Mae Ayaka Muto yn ymdreiddio i dafarn poeth y gwanwyn lle mae gweithwyr peirianneg sifil yn aros am amser hir ym mynyddoedd Talaith Yamanashi! A yw'n wych bodloni gweithwyr peirianneg sifil sydd mor egnïol fel nad yw eu codiadau'n ymsuddo trwy eu taflu â'u technegau balch?

Ayaka Muto infiltrates a hot spring inn where civil engineering workers are staying for a long time in the mountains of Yamanashi Prefecture! Is it great to satisfy civil engineering workers who are so energetic that their erections do not subside by tossing them with their proud techniques?