Erika, a nun of abstinence, a journey that must never be ejaculated

Sister Elyka must travel with Sister Tiana to the holy land in the far east to purify the sub・god that has been sealed in her body.
Because the god is sealed in semen, which is the source of magical power, and it is released if it ejaculates, Eirika is strictly forbidden to release the spirit during the journey.
In the meantime, while being attacked by demons and demons with tentacles that receive the disturbance of the sub-god, and called by the sub-god, I managed to avoid ejaculation with the assistance of Tiana and continue the journey to the east.
However, Erika who can not release the spirit and has the energy gradually can not afford, and Tiana who is watching such a state gradually awakens to sex ....

シスター・イーリカは体内に封印した亜神を浄化するためにシスター・ティアナと共にはるか東方にある聖地に向かわなければならなくなる。
亜神は魔力の根源である精液に封印されており、射精すれば解放されてしまうため、旅の間イーリカは精を放つことを厳しく禁じられてしまう。
その間、亜神の妨害を受けたり、亜神の呼び寄せた触手を持つ魔物や淫魔に襲われつつも、ティアナの補助でなんとか射精をまぬがれ東方へ旅をつづける。
しかし、精を放てず精力を持て余すイーリカは次第に余裕がなくなり、そんな様子を見ているティアナは徐々に性に目覚めていくのであった…。