The career changes for a magic user at level 15 are Sorceress, Enchantress, and Priest, and at level 30, the career changes are Witch, Magical Princess, Sage, and Bishop.

The career changes for a fighter at level 15 are Paladin and Dark Knight, and at level 30, the career changes are Valkyrie, Samurai, and Dark Lord. Each character has a different occupation, when the character reaches certain levels, they can advance to a higher class. In the PC version, a maximum of four people can be in the party, whilst in the PSP version, it is five. The party will often encounter enemies, which offer little experience compared to boss battles. In order to unlock more party members, the player must defeat certain characters in the To Heart 2 series and then they will join your side. In the beginning, the player will start off with two party members, Konomi Yuzuhara and Tamaki Kousaka, with these two characters, more girls can be unlocked to fight in the party. Instead, the player controls what skills and attacks the girls Takaaki encounters use.

The player assumes the role of Takaaki Kouno, the main protagonist of To Heart 2, however, this character cannot participate in battles directly.

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