第 8 集: 悠也與光希共赴水族館約會，而日奈則附身於光希體內。

8

While at school, Yūya receives two tickets to the aquarium from Neko. Mitsuki arrives home from school first and is shocked to discover a lewd magazine that results in her having a nightmare. When Yūya comes to retrieve his friend's magazine Mitsuki throws it at him upset that he has such a thing not knowing it isn't his. Yūya changes the subject by offering the tickets he had received earlier to her which makes both Hiyori and Mitsuki excited. Hiyori then possesses Mitsuki who blurts out to his surprise how happy she is to go with him. At the aquarium Hiyori (as Mitsuki) is overjoyed at the surroundings which makes Yūya happy. While looking at an ocean sunfish Mitsuki who is floating nearby asks Hiyori why they went with him comparing it to a date. Mitsuki jumps back into her body out of embarrassment, but upon thinking of being on a date with Yūya gets aroused and confused. The result makes her belt feel hot filling up the heart more, and causes Hiyori to feel strange. Later on Mitsuki and Yūya share their pasts with each other. Mitsuki tells him she now feels strange to have someone be there when she gets home as her mother left her alone when she went to work. She then asks him if he had a friend named Hiyori when he was little but Yūya tells her he never heard that name before. Hiyori tells Mitsuki that she got the name Hiyori from a book and can't remember her real name. While dipping their legs in a tank full of doctor fish, Mitsuki has a weird feeling but Yūya insists holding her legs in the tank thinking she will be fine. The result of the fish sucking, and her thinking of him results in another orgasm that fills up the heart more. Mitsuki gets upset with Yūya who didn't know that the fish bothered her, but after he apologizes she feels happy. Yūya goes on ahead while they are walking back home turning on all the lights in the house to welcome her back. While in bed Hiyori then tells Mitsuki that she thinks their synchronization ratio went up saying their hearts are connected. Hiyori also goes to say she will pretend she doesn't notice Mitsuki falling for him too making her embarrassed and causing her to deny it. (Source: Wikipedia)