The Japanese era name was altered to Tofugu.
Koichi was very happy to see that Viet had reformed himself from his evil way of life.
Don’t be so formal! President Koichi is very friendly.
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means renew so the verb vocab version is to be renewed. You're not doing the renewing directly, it's just happening (as renewing often does).
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: To be renewed you decide to go to a spa. You get in a bathtub and they pour in a lotta (あらた) leeches and eels to help you to be renewed. Feel the fear. There are a lot of them! Alternatively, you can imagine them pouring in a lotta Maru cats, because that's way fuzzier.