It had been 4 months since Iroha Tamaki, an important friend of Yachiyo, had left because she sacrificed her existence to perfect the "Doppel" purification system

"Iroha.."

Said the woman with long navy blue hair, her expression was downcast

"I wish you were here.."

Said quietly until you opened the door

"What do you want?"

Yachiyo spoke without encouragement but she seems to be attentive to your arrival