There were actually 4 ending of the game with the format 3 ending been when the protagonist saw every thing and peeped and saw his mother and gochi having sex in her room but didn't enter and closed the door quietly and choose to stay home, and at the last scene he it was the end of the year and the protagonist was at home alone remembering everything he saw that year in spring, summer, autumn and winter and said to him self that alot has happened this year and he's just trying to forget about everything.
But this ending was removed and replaced with the one where the MC abandoned his mother only to find out a few years later or possibly 2 years later that his mother and gochi are now in love, and possibly married or dating and his mother is also pregnant for gochi and both are starting a new life together and have both forgotten about the MC with the ending scene been the MC regretting ever abandoning her and says to himself "what a useless life he is.
Honestly I like the 1st ending 3 better cus he didn't abandon her and ruin his life and plus he behaved more matured in that one. And I wish the creator wouldn't cancelled it and made the current one where MC mother is pregnant for gochi.