That depends. He is a marriage candidate, but there are copies of Tree of Tranquility that have a glitch that makes it impossible to marry Calvin.
If you do not have one of the glitched games, then yes you can marry Calvin.
Chat with our AI personalities
No. He is not a marriage candidate.
Gill will only marry the female main character. He will never marry anyone else. Julius, Chase, Jin, Toby, and Calvin can marry a different girl but Owen, Luke, and Gill do not have anyone else that they will marry.
Yeppers.
Eggplant is in season during fall for Harvest Moon Tree of Tranquility
The only cheat I know for Harvest Moon Tree of Tranquility is infinite money.