Kaoru is a 17-year-old virgin who has an S&M fetish. He has always dreamt about an SM relationship with his childhood friend Nana, who is looked upon as perfect and is always the target of boys' eyes. Their relationship has somewhat deteriorated through the years, due to them hanging out with different people and because Kaoru is not taking his education too seriously. One day though, Kaoru's mother gives some of his S&M toys to Nana for safekeeping - Nana finds the leather one-piece that Kaoru bought and tries it on but accidentally locks herself in it and doesn't have the key! Kaoru frees her of the one-piece, but then Nana realizes she may like Kaoru's hobby more than she thought and subsequently the two of them start engaging in so-called "breathers". These breathers are intended to relieve Nana of stress, stress originating from her attempts at keeping her grades and her name perfect.

Sakura Nankyoku is a total otaku. Due to a fluke, she gets elected as her class' Student Council President. Everything takes off from there into a series of crazy misadventures revolving around Sakura, her family, and her classmates.

The earth shook. The sea roared. A far greater disaster followed. And then... There is a small house solitary standing by the seaside. A pigtail-braided girl is living there alone since that day. Mail is no longer delivered, but even this morning she's hanging out the laundry as usual. She's unaware that all around her, the clothes-pegs are quarreling, the pillow argues with the umbrella about the outside world, and the new toothbrush is unsuccessfully trying to be polite with the silent, old ones. Do things exist to be used until they are consumed or broken? Are they afraid of being thrown away once their life cycle is complete?

Second season of Pikaia!.