あいする
to love, to care for
A heart carried about in the middle of the character, with する bolted on to make it a thing you do. The same I あい that began every line of the letter. Not a feeling you have: a thing you keep choosing: あいする.
Heavier and far more written than 好き. 愛 あい on its own is love as a noun.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.