Based on a shounen manga by Takenashi Eri, serialised in Comic REX. 
Our unlucky protagonist, Jin, uses the trunk of a sacred tree to carve a statue for a school project. When he takes it outside, to his surprise it begins absorbing the surrounding earth and transforms into, hold your breath on this one, a girl! So like all similar setups this guardian deity is pretty pissed that her tree was cut down and lives with Jin while she takes out her anger on squashing bugs....er, cleaning the "Impurities".

Unaired episode included in DVD Vol.7. 
In this episode they attempt to make a movie with some money they found lying on the ground.

For his art project Mikuriya Jin carved a statue from the recently chopped local sacred tree. As he is about to bring it to school, the goddess of the tree, Nagi, descends upon the statue, having slept until now, not knowing of her demise. Since the sacred tree can no longer protect the surrounding area from impurities, Nagi has to do it herself now, dragging poor Jin with her.

What’s the best way to eat dessert? Do twins really have a psychic connection? What kind of guys are into moe girls? These are the kinds of questions that float through the inquisitive mind of anime super-fan Konata Izumi. When she’s not lost in her favorite manga or logging hours in one of her online games, she’s debating the mysteries of the universe with the best friends a girl could ask for. 
 
(Source: Funimation)

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