- Just any moment of interaction between Taka and Kana during the Childhood arc after the trip to the mountains probably qualify.
- During the trip itself, Taka's two Pet the Dog moments with Kana after he was a Jerkass Big Brother Bully to her earlier on it: Helping her with the flower necklace and taking care of her after he finds her at the forest.
- Taka's friends helping Kana escape a very awkward situation and some bullies when she attempts to return to school.
http://tvtropes.org/pmwiki/pmwiki.php/Heartwarming/KanaLittleSister
FollowingHeartwarming / Kana: Little Sister
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