Sena had bad time after she saw Kodaka and Yozora played together when she wasn't there. Pegasus noticed and asked her if she's well, and Sena said that she's fine it just the Neighbor Club members couldn't do anything without her, when actually she hadn't came to the club since the simulation date (detail in my previous post up there). Next day she decided to come to the club room just like usual and saw Yozora with the new hair.
That's what happen if they do return back to being Taka and Sora after Yozora revealed that she is Sora
Anyway, Sena felt left out because Kodaka and Yozora seems getting together after Kodaka remember that Yozora is his osananajimi. Didn't want to give up, Sena suggested them to play MonKari (that Monster Hunter rip-off) together. Sena gave Kodaka and Yozora a PSP with low-level character save data while she herself played with high-classed equipments and weapon. Her plan was to play a hard quest, made Kodaka and Yozora stressed of the difficulty so she could help them and single-handedly killed the enemy so Kodaka and Yozora would know that her existence is important.
Her plan failed since both Kodaka and Yozora didn't even know how to play. The moment Sena killed a strong monster, both of them are still far behind because they didn't know how to run
She felt useless again but then Kodaka, and even Yozora, asked her how to play the game and she regained her confidence. For once, they played like a real team, Yozora even gave Sena support, saved her when a monster trying to attacked her from behind.
They cleared the mission. Sena and Yozora compliment each other, but shortly after that they realized they unusual behavior and started fighting again, just like the usual situation on Neighbor Club. Then Kate-sensei came to call Sena (she calls her "Oniku-chan" XD) because Pegasus wanted to see her. When Sena left for a while, Kodaka noticed the resignation letter Yozora wanted to give on the previous chapter. Yozora said that she didn't need that letter anymore because now they remember each other.
When Kodaka gave back the letter to Yozora, Sena saw from outside and she thought that both Kodaka and Yozora do want to resign from Neighbor Club since they are friend already and don't need her, just when she thought if it was with Kodaka and Neighbor Club she could find a friend. Pegasus was in his way to the club room and he found Sena with her sad look again, so he came in to the room and said that he will disband the Neighbor Club.