Quick answer — Yuka Iguchi performed 4 anime themes, including "Grow Slowly" from A Certain Scientific Railgun S, "HELLO to DREAM" from Is It Wrong to Try to Pick Up Girls in a Dungeon? II, "Hey World" from Is It Wrong to Try to Pick Up Girls in a Dungeon?.
Yuka Iguchi performed the anime theme songs "Grow Slowly" (A Certain Scientific Railgun S), "HELLO to DREAM" (Is It Wrong to Try to Pick Up Girls in a Dungeon? II), "Hey World" (Is It Wrong to Try to Pick Up Girls in a Dungeon?), "over and over" (Is It Wrong to Try to Pick Up Girls in a Dungeon? III).
Yuka Iguchi's first listed anime theme is "Grow Slowly", the ending of A Certain Scientific Railgun S.
