released on January 29, 2014.
| Egao no Kimi wa Taiyo sa / Kimi no Kawari wa Iyashinai / What is LOVE? [Regular Edition / Type A] Catalog: EPCE-7024 | |
| Egao no Kimi wa Taiyo sa / Kimi no Kawari wa Iyashinai / What is LOVE? [Regular Edition / Type B] Catalog: EPCE-7025 | |
| Egao no Kimi wa Taiyo sa / Kimi no Kawari wa Iyashinai / What is LOVE? [w/ DVD, Limited Edition / Type A] Catalog: EPCE-7016 | |
| Egao no Kimi wa Taiyo sa / Kimi no Kawari wa Iyashinai / What is LOVE? [w/ DVD, Limited Edition / Type B] Catalog: EPCE-7018 | |
| Egao no Kimi wa Taiyo sa / Kimi no Kawari wa Iyashinai / What is LOVE? [w/ DVD, Limited Edition / Type C] Catalog: EPCE-7020 | |
| Egao no Kimi wa Taiyo sa / Kimi no Kawari wa Iyashinai / What is LOVE? [w/ DVD, Limited Edition / Type D] Catalog: EPCE-7022 | |