As Ringo gets help from Himari preparing lunch for a 'date' with Tabuki at the park, Kamba tasks Shōma to go with her and look through her bag for her diary, believing it may be related to the Penguindrum. When they reach the park, they encounter a runaway skunk who runs off after squirting Ringo in stink. After changing clothes, Ringo and Shōma meet up with Tabuki, who brings along the woman Ringo saw him with, an actress named Yuri Tokikago. Come lunchtime, Ringo's prepared lunch gets eaten by crows, leaving her in the shadow of Yuri's picnic. In order to fulfil a 'first kiss' note in her diary, Ringo plans to jump into the pond and have Tabuki save her. However, the skunk appears again and knocks her in, forcing Shōma to save her instead and use CPR on her, though Ringo believes Tabuki to be the one who did it. Later that evening, a girl that Kamba met up with earlier is pushed down the escalator of a train station, completing the description in Ringo's diary.

Kanba goes to confront Natsume about the memory-erasing balls and why she desires the diary, unaware that she only has half of it. Meanwhile, Ringo is still determined to complete Project M with or without the diary, making a love potion to give to Tabuki, which actually seems to work. As Ringo decides she can't go through with it, Yuri helps her come to the realisation that she is actually in love with Shoma. As Penguin Himari brings Shoma and Ringo into a Survival Strategy meeting, Himari tells them about the day 16 years ago when Momoka died and she was born, which turns out to be the day that Shoma and Kanba were also born.

After realizing that she was tricked by Yuri, Masako reminisces about her grandfather, a powerful business tycoon who expelled her father claiming that he was not strong enough to be allowed a place in the Natsume family. After dreaming countless times about having him killed, Masako rejoiced when her grandfather inadvertedly poisoned himself to death by eating ill prepared Fugu. Masako since then assumed control of her family's corporation but was sad that her father had never returned home, until somehow her grandfather's spirit posessed Mario's body and forced her to eat the same poison that killed him to protect her brother, but Sanetoshi appears to save her life. Later, Masako sees Kanba hanging out with the same elusive men who took her father away and Sanetoshi asks Masako to join them in his plan to "put the world back on track" but she promptly refuses.