Multi’s “sister.” Serio is also a maid robot, designed at the same time as Multi, but by a different division of the company. She is an excellent maid. She’s very efficient, cooks well, and completes all her duties in a timely manner. However, Serio has a rather cold, unemotional, “matter-of-fact” personality. She is polite, but shows none of the heart that Multi does.  (Source: RightStuf)

For as long as Akari can remember, she and Hiroyuki have always been friends. But with time, everything changes, and her feelings have turned into something more. As a new semester of high school begins, will the two childhood friends come closer together or drift further apart? Join Hiroyuki, Akari and all their friends - the bubbly Shiho, the quiet Serika, the lovely Kotone, and more - in this heartwarming tale of love, relationships and friendship! 
(Source: RightStuf)

[Wiki (en)](https://en.wikipedia.org/wiki/Michiko_Neya) | [Wiki (jp)](https://ja.wikipedia.org/wiki/%E6%A0%B9%E8%B0%B7%E7%BE%8E%E6%99%BA%E5%AD%90)

Michiko Neya is a Japanese voice actress. She formerly worked at Arts Vision but is now a freelancer.

Non-anime roles:~!
• Ami Barklight in "Tales of Phantasia -Full Voice Edition-" (VG)
• Cindy Campbell (voiceover for Anna Faris) in "Scary Movie" (live-action movie)
• Ellie in "Magic School Lunar!" (VG)
• Emeraldas in "Xenogears" (VG)
• Emma Hetfield in "Wild Arms Alter Code: F" (VG)
• Hibiki (Sekirei No.12) in "Sekirei" (drama CD)
• Hsien-Ko / Lei-Lei in "Darkstalkers II" (VG)
• Hsien-Ko / Lei-Lei in "Darkstalkers III" (VG)
• Kira in "The Power of the Dark Crystal" (2008 movie)
• Lei Lei in "Namco X Capcom" (VG)
• Linda Zakroid in "Mitsumete Knight R Daibouken hen" (VG)
• Linda Zakroid in "Mitsumete Knight" (VG)
• Mako Sato in "Initial D: Special Stage" (VG)
• Maria Traydor in "Star Ocean : Till the End of Time" (VG)
• Martina Martinez in "Shriek If You Know What I Did Last Friday the 13th" (live-action movie)
• Natalia L. K. Lanvaldear in "Tales of the Abyss" (VG)
• Ouka Nagisa in "Super Robot Wars Original Generations" (VG/PS2)
• Rose in "Namco X Capcom" (VG)
• Rose in "Street Fighter Alpha 2" (VG)
• Rose in "Street Fighter Alpha 3" (VG)
• Rose in "Street Fighter Alpha" (VG)
• Sato Mako in "Initial D Kuroi Inazuma: Aratanaru Fuhai Densetsu " (Drama CD)
• Sato Mako in "Initial D: Impact Blue no Kanata ni..." (Drama CD)
• Sato Mako in "Initial D" (VG)
• Seana in "Elemental Gearbolt" (VG)
• Sidney Prescott (voiceover for Neve Campbell) in "Scream series" (live-action movies)
• Sophitia Alexandra in "Soul Calibur 2" (VG)
• Sophitia Alexandra in "Soul Calibur 3" (VG)
• Sophitia Alexandra in "Soul Edge" (VG)
!~

Time flies by; Hiroyuki and Akari are 12th-graders now. Both of them and their friends have grown up gradually in someway, physically or mentally, but one of their best friends is missing: the lifelike android Multi. To their surprise, Multi is brought to their campus again without notice, yet she is no longer the same Multi they have known.
 
(Source: Anime News Network)

This is a special to "To Heart ~Remember My Memories~", which includes fighting scenes between all the female characters.

Six short "Special Broadcasts" (omake) were produced and aired after selected episodes. They lasted around five minutes and followed the general style of the main anime, although the characters are drawn as chibis. 
(Source: Wikipedia)

Akari is a cute but somewhat inhibited teenage girl who attends high school with her childhood chums, Hiroyuki and Masashi. Though she regards these two along the lines of siblings, Akari finds her world becoming troublesome as her adolescent affection for the generous and warm-hearted Hiroyuki begins to grow onto something more. The complications only thicken when a beautiful senior, Serika Kurusugawa, steps into the picture. Akari finds her solution in an unlikely place: An android named Multi, who happens to be training to become a full fledged maid robot, just might be able to use her machined mind to help Akari overcome her shyness and win Hiroyuki's love! 
(Source: ADV)

An anthology of ToHeart 4-koma by various mangaka 
 
Volume 1 (1999/10/01) 
Cover Illustration: Ogataya Haruka 
Back Cover Illustration: Hasegawa Ryuu 
Cover Flaps Illustration: Majime Takako 
Illustration: Okuya Kahiro 
1. Dare ka Ore wo Tomete Kure (だれか俺を止めてくれ) [Hazama Masashi] 
2. Kyoushitsu no Fuukei (教室の風景) [Tonami Minato] 
3. Inuchikku Dantai (イヌチック団体) [Munekichi] 
4. Ai no Memory (愛のメモリー) [Chikusa Yuuko] 
5. Sankaku de Tobase!! (三角で飛ばせ！！) [Tokita Monta] 
6. Anata ni Todoke: Telepathy (あなたに届け▽ テレパシー▽) [Strike Heisuke] 
7. Kurusugawa. (来栖川。) [Hiiragi Seia] 
8. GET Da ze! (GETだぜ！) [Makihara Hisato] 
9. Ai to wa Tatakai de Ari Kesshite Koukai Shinai Koto (愛とは闘いであり決して後悔しないこと) [Tenmaru] 
10. 2-wa no Hato (２羽の鳩) [Nobi Chijimu] 
11. KIND OF LOVE (KIND OF LOVE) [Nekoma Kotomi] 
12. Koi no Target Girl (恋のターゲットガール) [Majime Takako] 
13. Nanchatte To Heart (なんちゃってTo Heart) [Machimura Takakyu] 
14. Do Heart? (Do Heart?) [Uchimura Kaname] 
15. Konna Otoko wa Mote nai (こんな男はモテない) [Fuji Ao] 
16. Otome no Kimochi (乙女のキモチ) [Okuya Kahiro] 
 
Volume 2 (2000/01/01) 
Cover Illustration: Tokita Monta 
Back Cover Illustration: Tonami Minato 
Cover Flaps Illustration: Munekichi 
Illustration: Hazama Masashi 
1. Atta yo (あったよ～) [Yuuki Shinichi] 
2. Motte Mote (もってもて▽) [Tonami Minato] 
3. Brand New Heart (ぶらんにゅーはーと▽) [Strike Heisuke] 
4. Visual Novel (ビジュアル述べる) [Munekichi] 
5. Gakuen Tengoku!? (学園天国！？) [Nanase Miki] 
6. Ojou-sama. (お嬢様。) [Hiiragi Seia] 
7. 2-wa no Hato II (２羽の鳩II) [Nobi Chijimu] 
8. Koisuru Kimi ni Sleeper (恋する君にスリーパー) [Tenmaru] 
9. Aa Goshujin-sama (ああっ　ご主人様っ) [Nekoma Kotomi] 
10. Hana to Mitsubachi (花とみつばち) [Chikusa Yuuko] 
11. Ai to Makoto (愛と誠) [Yoshida Hajime] 
12. Shugyouchuu ni Tsuki Tachiirikinshi (修行中につき立入禁止) [Osada Kaoru] 
13. BAD LUCK ON LOVE (BAD LUCK ON LOVE) [Tsushima Akira] 
14. Hibi Kore Nichijou (日々これ日常) [HRS34] 
15. Sakurasaku (サクラサク) [Nonohara Chiki] 
16. Ai wa Fushigi (愛は不思議) [Okuya Kahiro] 
17. Kono Manga wa PokeSute Mitaiou (この漫画はポケステ未対応) [Tokita Monta] 
18. Test Biyori (テスト日和) [Uchimura Kaname]